I read the Codex, and know how to activate a new theme. Can anyone advise me how to prepare (header photo, background photo, column format, etc.) a theme before switching to it, so that my readers won't know I'm working on making a change? It's like changing clothes in public, and I don't like that idea. I want a seamless switch to my new theme, already dressed in its new outfit!
Thanks in advance!
Dena