you could just put the motor from the 95 into the 91. it will be easier than swapping the trans. Unless you just want a 5 speed. It can be done, but you do have to swap everything, including the pedal assembly.
GroveCDN: I hope you never have to ask for help, because obviously if you ask if a mod has been done or for any tips, by your logic you must be incapable of doing it and should just go buy a bought rig...