I use to pay for stuff, now I try to do it on my own.... I always did my own maintmance, but I will install the bap/injectors/whipple and all the supporting mods myself along with a off road pipe. The only thing that I don't feel comfortable doing is a clutch and a complete engine rebuild.
for me it depends, some jobs are just worth it to me to pay someone else to do it. like when i had my irs bushings installed, i have enough reasons to cuss already LOL
So far I've done everything myself except for the subframe connectors and gears. I'm certainly not above paying someone though if I don't feel comfortable doing it. Wiring, for instance, is something that I hate to touch.
I am a DIY'er but have been paying for it here lately because I am out here in the sandbox and want to drive my car when I am home on vacation rather than work on it LOL
If you want something done right, you have to do it yourself. I have witnessed too many "experts" screw up a piece of equipment because of their incompetence. For example, take a look at 95% of car audio installs. Looks like a blind monkey did them.