I usually use
Sidlwidl when I want to see the changes I am making. (If you download sidlwidl you'll also need to download the .NET SDK version 1.0 *not newer version* from...
http://www.microsoft.com/downloads/...&displaylang=en)
When I need to change something small like a border from true to false or if I need to copy and paste parts of files, I use
XMLwriter but there are free programs that do the same thing like
MoreMotion XML Editor and some people even use notepad from what I hear =)
hope that helps =)
Starrie