The saddle is a breeze to replace if you have an exactly correct replacement. Unfortunately correct replacements are rare. In all practicality you need a luthier or a VERY good tech to custom fit one correctly.
1.) The thickness must be enough that you need pliers to remove it.
2.) The height must be just right for action.
3.) The compensation must be correct for all 6 strings.
4.) The top radius must compliment the radius of the neck.
A lot of places sell "replacement" saddles for different brands but in my observation most aren't right.
www.guitarsaddles.com is well respected and has a nice selection but, as an example, they only list one replacement size saddle for all Washburns. I know that Washburn's neck radii are all over the place, even on the same model, and there's no way one saddle will work right for all of them. You need the actual guitar in hand to do it correctly. If the top radius is too small then the middle strings will be higher than the outer ones and vice versa.
If you decide to have a saddle made talk directly to the person who will be doing the work. If he makes it sound like an easy thing or just wants to "drop in a new one", he doesn't know what he's doing.
