it is not really difficult to convert from an auto to manual. The only in car wiring that you need to do is at the wiring harness that is connected to your current automatic shifter.
1. two of the wires in that harness need to be shorted so that your key lock is disengaged
2. second you need to find the wire that is tripped when the car is in reverse, this will turn on your reverse lights, run this wire to your reverse gear sensor on your tranny.
I would try doing a search on the internet to find out which need to be tripped for the key lock, dont do it by trial and error.