While I have already discussed about the pros and cons of the Part time entrepreneurship I think I need to enphasise one thing about your regular job. You need to do a good work at your regular job.
It seems that there is a thing in people minds (especially the management minds) to remember only the things that failed or didn’t perform nicely. Performing good at your regular job becomes really a challenge after your entrepreneurship second job kicks in your life.
So my advice is to give 100% on your regular job as on your entrepreneurship as well. This becomes quite difficult and obsessive especially in stress periods; is not really difficult to have longer work hours, but its really demanding to have longer stress hours.
Working 100% on your regular job will also help your entrepreneurship side; the feeling of accomplishment and the good results will help you surmount easier the entrepreneurship issues. You might have problems with your own business, but the thought that you did something good that day will always help you get over it.
