I did valve covers on a 2.2 and it wasn't a terrible experience. And to be honest, pulling a 2.2 or 2.5 is about as easy if not slightly easier than dropping the 3.2 out of my 911.
Did a little surfing. The link below covers Timing belt and valve cover replacement. Ignore the tb info and just grab the valve cover info.
https://www.subaruoutback.org/forums/99-do-yourself-illustrated-guides/26199-2001-timing-belt-water-pump-valve-cover-gasket-set.html