Join Date: Oct 2007
Location: Waterloo, ONT
Bikes: Road: Trek 1.5 (2007). Mountain: Santa Cruz Chameleon (2008). Beater: Peugeot Recorde du Monde (1850)
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Everything is pretty easy, especially if you have the proper tools. I'd consider a suspension fork overhaul difficult, but everything else is easy.
Change tires when they're worn
Change brake pads (I do this regularly; pads are cheap, broken bones are expensive)
Change chain when it's worn out
Clean chain, if it's still good, but dirty
Clean rims, if needed (use alcohol or water).
Lube derailleur wheels
Repack ball bearings in the hub w/ grease.
I guess out of that list, truing the wheels, changing the tires, and repacking the hubs is the most time consuming.
If you have a bike with suspension, you might have to check up on your front and rear suspension. I would take it into the LBS for this.