You'll need a pair of powerfold mirrors, of course.
Then, the best way forward, if you have a donor car is to get the driver's door electronic module and either or both of the keys. The module is a direct replacement and you need to transfer the PCB of the key(s) into your own key(s) so that they will then operate your door locking alongside the replaced powerfold programmed module. You will, of course, have to retain your original immobiliser chip(s). The whole job is risibly simple and takes less than an hour. The scariest part, for somebody with no experience, is getting the door cards off
If you were to obtain the parts but were not keen on ripping your car apart, you could always turn up at the nano-meet(s) I hope to get off the ground in the near future.
Alternatively you need to visit a dealer or indie to get your original powerfold module enabled (programmed) for powerfolds, in which case you only need install the mirrors. Programming modules is something I hope to be able to do when I get my head around the SDD / IDS software.
If you have a donor car though it's a lot more convenient as it doesn't require any programming. The powerfold mirrors do NOT have to come from the same donor car but, clearly, the key(s) and door module must.
I hope that helps?