From the professional automotive standpoint you'll always be upside down. Your time will always be worth more than your able to be compensated for. I spoke with my accountant recently and we looked at several similar businesses and they've always "just gotten by". Automotive repair and aftermarket unless done on a large scale is never a big money maker when compared to the risk, investment and effort required. In other words you'll never be well off working on cars unless you own multiple shops.