Hey bruin, it seems that you are mentally motivated for this task and seem to know enough about your industry to make it work.
Now, being good at what you do just isn't quite enough. You've got to be better than most of your competition in order to get customers to even begin to think about you.
I'm far from an expert, but I can tell you that I also own my own small business as an auto repair facility for over 33 years now. I also have an MBA in business mgt, so I've got a hint how a successful business works.
Here are some points to consider........
-Incorporate for limited liability.
-Hire an accountant, they are not very expensive and are the professionals. Tax rules are a biotch.
-Primarily helping people(customers) should be your main policy. This is the most important advice I'd give anyone who is self-employed. Following this rule will tend to always enable you to operate honestly and to the best of your ability. Money & profit will then come naturally.
-How tough are you? Sick, lunch, aches & pains, 9 to 5, coffee breaks, etc, are not words which can be in your vocabulary.
33 years and I never took a sick day. Doesn't mean I was never dead sick, just can't think about it.
-Liability insurance is a must.
-Warranty all work & all warranty work takes preference.
-Be nice. As tough as it gets, and it gets real tough with certain types of people. BTW, this is my 2nd most important hint.
-Have a game plan with a future forecast and follow it.
OK, just a few hints here to get you started. There is much more, but I could literally write a book.
Best of luck if you decide to go forward with the venture.
-Ken