Have just done this today and it is relatively straightforward.
Mine is a 2012 and has the rivets which I will replace.
They seem like a tight fit but it is possible for the subframe to move up and down on the bush.
I used the Meyle HD bushes which fit fine.
As has been said before a 24mm ratchet spanner is a big help.
The only tip I have to add is that if the bushes are stiff coming out rather than stress the tool just apply some heat to the bush housing and this helps reduce the friction.
Glad I did mine as they were starting to debond from the metal core.

Click image to enlarge

Click image to enlarge

Has anyone had a good experience of a garage that could do a good and reasonable job, as my 2006 FFRR is mainly strong and well worth preserving, but having read all your excellent posts, and being realistic about my limited time, space, and skill, any recommendations on a garage that could get my RR back end returned to full operating capability would be hugely appreciated please? Noted earlier comments re EBay subframes costs too if I need to go that far, as have some frame welding a couple of years ago, so the rots sadly started Current wheels:
2006 RR S/C (+ chipped + Bespoke S/S Sports plus exhaust)
1985 Defender with V8 4.2l conversion
2012 Aston Martin DBS Volante