I have a 03 Silverado 2dr with Manual windows, and want to switch to Power how hard would this be and what all will I need to do this thanks for all the input and help.

 

Well I know I would go to pick n pull or whatever junjyard you have around you,
get 2 doors already wired for power, install them on the truck, then wirethe doors into the fuse block.

If you are wanting to keep you doors and drill out slots to put in toggle switches to roll them up and down...
That would require alot of work and I will let someone else chime in to give you advice on that.

 

its a pain in the ***, I helped a friend of mine do it in his and it was very mind boggling, we replaced the doors and all but it did take us awhile