I'm thinking about getting one of these kits to change my manual door locks to power door locks, and eventually hook it to a remote system for keyless entry. If you've installed one of these kits, how hard is it to do as far as installing the hardware and hooking up the wiring?

Unfourtunately no sites that sell these kits post the instructions so I can look through them first.

I imagine that it's difficult to get the hardware into the door since it's such a small area with no great access.

I haven't done a kit, but here is some info...
http://www.automotiveforums.com/vbulletin/showthread.php?t=544748&highlight=power+windows