Easiest is to get another auto box, then its done in a couple of hours for under £150.
Manual conversion:
Box
fly
mounting brackets, mounts?
Shifter mechanism and trim
Pedal box/pedals and fittings
Radiator/box cooling delete
Relays/fuse box work
ECU? (imob/keys etc)
Probably missed a few things or got some wrong

Donor car could be had for as little as £150 so its not a major cost if you are careful its mainly time and space
