Jeff, Don't scare this entrepanuer away with your post.
Sorry, I will leave the reality out of it next time.

Really opening your own business is a great time, you make tons of money, have loads of free time, and all the stress in your life goes right away because now you are your own boss, its great, really

Is that better, maybe thats what he wanted to hear
Not trying to scare anyone away from doing anything, I just think many, many people don't know the true reality of opening most businesses. I say most because I know for certain there are those that freshly open and go pretty smooth and make good money, an automotive shop is not one I have ever heard of doing that, nor are any of the trades, like I am in.
I wish you the best of luck in your venture, in this economy you have to make your own luck. If you and your family are not dedicated to giving this business 100% of your time right now, don't bother, it isnt going to work.
And as the others said, either find a way to do it without a partner, or be prepared for things to go awefully sour, have a back up plan. And if this partner thing is going to happen, dont be foolish, spend a bunch of money and have the best attorney you can find draft up your partnership papers, dont try to do this on your own. Attorneys have settled lots of failed business partnerships (get where thats going?) and know what terminology needs to be drafted up front.
Jeff