I am also a firm beleiver in doing your own work.
I am 18 years old, and got my first car when I was 11. It was an 85 Mustang 2.3 with a blown motor. The guy who gave it to me also gave me a decent short block with the car. Now mind you, i was 11 and within 6 months, I had that new short block in their and the car running (things take a little while when your that small!)
Everything i have ever learned has been hands on experience, and just getting in their and figuring it out.
The only thing that i EVER pay anyone for is shortblocks. I have a engine guy who assembles them for me, while i am standing their helping out. From their on, it goes on the stand in the shop and gets assembled the rest of the way. As far as assembling rear ends go, that is not rocket science either. You get yourself a manual, a vice and a nice dial indicator and your in business.
Also, this leaving the tuning to the pros is a bunch of BS. With a proper education on the inner workings of your cars ECU, you can essentially do anything you want with it. I myself, even if i were not tuning, would like to understand what the hell is making my car tick.
And as for taking anything to the "professionals," In the past 6 months, i have not seen anything come out of a shop that wasnt laughable. I mean buddies of mine, taking cars to exhaust shops, only to have it fall of weeks later becasue the dumbass didnt use rubber isolators. Tire shops putting unidirectional tires on backwards, hell even had a friend who went in for an oil change, and the dumbasses drained his transfer case instead of the damn motor. IMO, mechanics are just as retarted, if not more, than the common gearhead. The only mechanic i trust, is my dads best friend, who had been with ford for almost 40 years.
Also, all you people out their who use the excuse that, "i need to drive it to work the next day," my advice to you is that, your project/fun car mixed wiht your daily driver, does not work too well. Do yourself a favor, and take that next 6 or 7 hundred bucks you might spend at a shop and get yourself a beater. Hell, I myself drive a damn purple escort to work everyday, that cost me 400 bucks.
Ive been waiting for an opportunity to say this but, get off your lazy asses and learn something. Dig in their and figure it out. QUIT MAKING EXCUSES!