When editing a home screen, is there any program that will let you preview what it will look like, versus actually transferring it to the phone and installing it, and THEN seeing what it looks like? I am nervous but willing to try making my own but I foresee having to install/uninstall it a lot until I get it right. I have it all sketched out how I want it, I just have to bite the bullet and try it.

Many years ago I worked with a scientific publishing program called TeX which seems similar to the xml, but there was a way to 'run' it and see the final version, so I could make corrections as needed along the way. Just wondering if there's something like that for this.
Cindi