Chance of H1B petition and approval

Thanks in advance to all answers.

I have a 4-year bachelor’s degree in computer science. I have 3+ years experience in IBM software labs.

I plan to have a consultancy file and sponsor my visa.

What are the chances of me getting the visa? I am confident about myself for the interview but it is background processes which scare me because there is no control there. Also, does the reputition of the consultancy make a big difference? This one has close to 100 employees and I will be working for a client (not known - yet to have the interviews).

Thanks again.

Are you in India? What are you actually scarred of?