is it hard to convert non-power doors to power windows?

I would guess the hardest part would be the wiring if there isn't a place for it on the harness or w/e....just curious if it is possible without any major undertakings

 

wire harness, motor/regulators, switches, and door panels. hardest part is getting the old wiring out and the new in.

 

I think the harness already has the wiring in it... I'm thinking about this as well since I might be getting a roller with power windows.

 

cool, thx for the info