I've always done mine myself - that way I know what's been done and there's only me to blame.
I agree - I started off thinking I would be like Jays - minor stuff, but as I get in to my car I am doing more and more myself. SOme stuff will always be outside of my capability but most stuff can be researched and carried out (often with help on here).
That said mine is an older car. I doubt I could do the same with a newer one....