Do you want to learn how easy it is to build an accessible website from the ground up (it *is* harder when you're trying to retrofit an older site, granted)? Here's some books to look at, any one of them will give you what you need to get started:
Building Accessible Websites by Joe Clark
Constructing Accessible Websites by Jim Thatcher, et. al.
Designing with Web Standards by Jeffrey Zeldman
Have a look at Joe Clark's blog, or jimthatcher.com, or A List Apart. All of these sites will get you started. Once you start reading about accessible design, you won't be so freaked out, you'll realise that accessible design is GOOD design, and it is the first step towards design that is usable for ALL your potential users.
I wish I had the info to hand, but there is a study out there somewhere which asked both disabled and non-disabled users to perform tasks on a website before and after it had been made accessible. BOTH groups found the tasks easier to perform on the accessible site.