Easyish job depending on your spanner skills. It will require hitting you frame with a mallet and drift to get the old bearings out, that can be a little disconcerting. You soon get pretty flippant after you have done it a few times.
You will also need the press tool to get them back in. I think it cost me £35 from the Santa Cruz uk website, well worth the money. If your handy with a lathe and have a mate with a CNC he could probably sort one out, otherwise buy the proper tool.
If you buy the service kit from Santa Cruz you get the loctite etc thrown in and I don’t think it’s massively over the odds on price, been a while since I have done it though, it may have gone up since!