Hello there,
How is the IT Shop market in your country / area ? If you think that there is a real opportunity for business, and that your current company is not exploiting that opportunity, than it would be a good idea to start something.
However, even though i'm no IT professional, the state of the Desktop and Laptop markets make me believe that IT shops are not really what is most likely to grow in the near future.
Your personal context is highly relevant to company creation, but it's not, in any way, what is most important. What is really impotant is that you make sure your future business actually answers a market need.
In France, people who have been working for a while in a company (something like 3 years) can take a part-time leave in order to start a new business. Essentially, you get 2 days per week to work on your project, and retain your job for 3 days a week. Is there maybe something similar in your country?
I'm CEO of a small software company, and teach entrepreneurship in a top european business school.
Hope you find your way