I've converted both my windows & doors from manual to power.
Unfortunately you're dreaming if you think the wiring is there. There is no wiring, no relays, and no fuses. You're on your own up a creek as far as that is concerned.
That said... new door locks are easy... just drill & install actuators a few inches from the lock- a little bent hook clamped to the existing bar is all it needs. You can pickup power from in the dash console, or you can bring it through the firewall (You'll want power thats live at all times, which the ignition has). I brought mine through the firewall since I have a custom box with relays & extra posts for my mods under the hood.
Windows are pretty easy also... unbolt existing crank mechanism, the arms are just in tracks, and they will slide out the end of the rails.
I'll take some pictures tonight- the window harness I'd recommend buying, but you can wire up one side to be independant of the other, or have one control both. I have 2 switches on driver side, and one on passenger. My lazy ass hasnt gotten around to painting them yet, but I will
I'll take my door panel off this weekend and take some pics, I'll also digup my folder with all my links on where I bought the stuff.