can't comment on the reclining seats, they are something I dream of but alas do not possess.
In the non-recliners fitted to my car they're relatively easy to fit.
Seat out, remove the trim clips, stuff the heating pads into the seat (gynaecology skills help here) and reassemble.
The wiring is relatively straightforward too.
Access is, however, dreadful. If you're bendy and agile you might be fine, I'm not and I'm still hurting!
