Hi ppl

I need some help. I own a S4 RX7 GT-R that is currently auto. I wish to convert it to manual but im having a lot of difficulty in finding the right information. It's getting to the point where im thinking of selling my car, which is really the easy way out (not what i want to do)
Ive been told so many different stories so what im really after is to know if anyone has done this in the past.
Bearing in mind that i live in nz and don't have the money to talk to anyone via phone in australia i would rather deal via net/email.
Any help would very much be appreciated.