Hi i have done exactly this to mine, took out both front seats took them in the warm house and got started.
took me about 2hours max, very simple indeed,
the seat bases are easily unclipped and swapped over, mine were heated leather so i had to splice and re join the cables, simple job also,
while i was there i unclipped the worn bolsters and swapped them over too, the only thing you cant swap over without a lot of hassle are the
seat backs and upper sides, i know have a lovely new seat to sit in, cost was Zero.