Replacing the regulator is very easy.
remove door panel , like a dozen screws around edge of door , behind door lever under little cap , and 2 under the armrest handle.
peal back the sound barrier/plastic. i just ripped mine off.
remove 4 bolts holding regulator in , and 2 more holding the glass in , 10 mm wrench on these 6 bolts iirc.
wiggle regulator out and reinstall. pretty damn simple. this pretty much applies to both manual and power regulators , as ive done both.
6 Duratec Focus
3 04 zx4's
2 05 zx3's
1 03 zx3