Pilot

All the details related to CPL Training are mentioned under:
Student Pilot License (SPL) & Private Pilot License (PPL) are intermediate stages of Commercial Pilot License Training.
You will be issued an SPL by the flying club after some hours of ground classes and an internal exam. Thereafter you shall become eligible to start flying training.
For becoming a commercial pilot, there is a specific eligibility criteria, which you should first be aware of. This is decided on what subjects have you taken in class 12th. It requires 50% marks in PCM to be a pilot. And, even if you have not opted for the same, then you can appear separately for these subjects and become eligible. Further, you should be aware that you are medically fit to be a pilot, so I would suggest you to visithttp://www.dgca.nic.in/medical/medical-ind.htmandgototheclass 2nd examiners tab to find out doctors who will examine you for initial fitness. You can visit any doctorate from the list as per your convenience. Once you are done with class 2nd medical, find out a suitable flying club for you as per your convenience. You can fly in India or abroad. I would suggest you fly in India. Besides finding the club, be aware that you will have to appear for:
1. Air Navigation
2. Aviation Meteorology
3. Air Regulations
4. Aviation Technical
5. Aircraft Specific
6. Radio Telephony
Here, 1-5 are conducted by DGCA and 6 is conducted by WPC. Prepare for these subjects and appear, as exams are conducted every quarterly. For preparation, flying club will help you or there are private instructors available in metro cities as well. You will fly for 200 hours + Clear DGCA and WPC exams + Clear Class 1st medical, then you shall get your CPL. The next license is ATPL, which you shall be able to apply for once. You will then have to probably fund or self-sponsor your type rating on whatever fleet you are selected in an airline. Then, you finally get a job as a pilot. I hope the process is well explained to you. CPL is an expensive affair. It might cost you around Rs.18-20 Lacs for flying + DGCA exams Rs.500/- each exam + Medicals for Rs.10, 000 + endorsements and license issue fees around Rs.25k + Type Rating around Rs.15 Lacs. So, decide wisely before you enter the field.

Yes, you can. The minimum eligibility requirement for CPL is just class 12th. You should have passed class 12th with PCM (50% marks). For becoming a commercial pilot, there is a specific eligibility criteria, which you should first be aware of. This is decided on what subjects have you taken in class 12th. It requires PCM to be a pilot and, even if you have not opted for the same, then you can appear separately for these subjects and become eligible.
Further, you should be aware that you are medically fit to be a pilot, so I would suggest you to visit: http://www.dgca.nic.in/medical/medical-ind.htm and go to the class 2nd examiners tab to find out doctors who will examine you for initial fitness. You can visit any doctorate from the list as per your convenience. Once you are done with Class 2nd medical, find out a suitable flying club for you as per your convenience. You can fly in India or abroad. I would suggest you fly in India. Besides finding the club, be aware that you will have to appear for:
1. Air Navigation
2. Aviation Meteorology
3. Air Regulations
4. Aviation Technical
5. Aircraft Specific
6. Radio Telephony
Here, 1-5 are conducted by DGCA and 6 is conducted by WPC. Prepare for these subjects and appear, as exams are conducted every quarterly. For preparation, flying club will help you or there are private instructors available in metro cities as well. You will fly for 200Hrs + Clear DGCA and WPC exams + Clear Class 1st medical, then you shall get your CPL. The next license is ATPL, which you shall be able to apply for once. You will then have to probably fund or self-sponsor your type rating on whatever fleet you are selected in an airline. Then, you finally get a job as a pilot. I hope the process is well explained to you. CPL is an expensive affair. It might cost you around Rs. 18-20 Lacs for flying + DGCA exams Rs. 500/- each exam + Medicals for Rs.10, 000 + endorsements and license issue fees around Rs. 25k + Type Rating around Rs. 15 Lacs. So, decide wisely before you enter the field.

Absolutely, there is a minimal issue. There is a requirement that if you need glasses, then you must carry 2 pairs with you at all times.
Here is an extract from the CASA Designated Aviation Medical Examiner's Handbook.
Professional Flight Crew and ATCs
For all professional flight crew and ATC: 6/9, corrected if necessary, in each eye separately. Additionally, the acuity must be 6/6 or better when tested with both eyes open.
Applicants with high refractive corrections (i.e. greater than +/-5 dioptres) should be advised of the possible complications, which may affect their vision, and of the implications for their aviation careers, particularly their increased statistical chance of retinal detachment.

Becoming a commercial pilot can be considered difficult, but just as difficult as many things we achieve in life. Once you become a commercial pilot, to keep being one, you need the same level of dedication and effort you put when becoming one.
It requires dedication, studies, and some personal sacrifices. You need to keep current all the time, so you have to keep studying throughout your entire career.
You will have simulator examinations every six months and every time you fly a new aircraft type. You also have to pass a medical examination every year.
Since I'm sure being good at any profession requires similar effort and dedication, I would say that it is not very different from any a career path you decide to choose.