Editing Forum Styles such as Vbulletin in WYSIWYG . Is that possible or stupid?

Which WYSIWYG program are you using? It's a good idea to keep code far far far away from FrontPage.

It depends on your html knowledge, i would stay away from editing tpl files with a wysiwig editor! but if your html knowledge is limited then i would say yes it is possible to edit your templates in a program like dreamweaver. Just remember to make backups of everything you edit.