I replaced my passenger side regulator myself. The cost from Ford for the part was 157.50. I found the part later on EBay for only $50.00!
It is pretty simple to change out yourself. It took about 40 minutes from start to finish. There are only a few bolts to remove, and the new one fits right in. The Haynes Manual is what I used for instruction, but I am pretty sure there is a how-to on this site.