they are stupid easy to work on as long as the bolts don't break. So far the hardest job for me was removing the heat shield. I hear that working on the rear suspension (control arm bushings and wheel bearings) can be a pain. all comes down to if things are seriously stuck.
1st things I did was fluids (use yellow metal safe oil in the trans), belts and hoses,T stat, water pump (well after it leaked),alt (after it shorted out), FI rubber hoses with correct clamps.
the list goes on but you get the picture, mainly simple stuff that was done wrong (like wrong hoses and clamps on FI) normal maint, and electrical connections including new rubber boots to keep out moisture.
Sensors on the T stat housing are often bad. Hopefully no one has monkeyed around with the AFM, it seems to be the go to thing anytime the FI is not working right.