I just changed from an E36 to an E92. I'm using posts on these forums to learn about things that are new to me - like registering a new battery.
But the message I get is that mechanical stuff is still OK for DIY as long as you have the skills. Brakes, rotors, suspension, engine accessories....that's fair game. My skills extend to engine and manual transmission rebuilding, but I won't take those on unless forced to because I lack good facilities for those jobs.
1983 Datsun 280ZX Turbo
2008 BMW E91 328xi Sportswagon
2009 BMW E92 328ix Coupe