power window help

I have a 1993 vr4. my drivers side window has been real slow lately...today it pretty much stopped working. how hard is it to replace.. i found a replacement, but i was wondering how hard it is. any help would be appreciated. thanks

here is a link that shows how to reinforce/repair a broken or new/broken window regulator for our cars, respectively. http://www.clan-davidson.com/jd/vr4/garage/windowreg/

thanks for ur help