replacing rear bumper
 

has anyone done it? how difficult is it? do you recommend getting it done at a shop?

I need to replace my rear bumper with another OEM one and want to find out if its do-able at home.

Very do-able at home. Half of the rear interior panels need to be removed, the tail lights need to be removed, then it's just a handful of 10mm screws and some plastic plugs. It's in the downloadable service manual too if you need more info.