I would suggest getting a job in the industry and trying to save up some cash for a while so that you are in a good financial position when you decide to jump out on your own.
If you approach auto and truck repair with this mindset you will probably burn yourself out. You better be passionate about working on cars and taking care of your customers even if you have to eat some of the cost of goods sold.
Michael this is good feedback! I definitely agree with you, you can't only worry about the numbers, you have to be passionate about the business and actually care for your customers if you want to be successful in the long run!
I agree with the GP margin. This will not make any money, the GP being added here will be easily consumed by the overhead costs. The profit will be zero lol