I want to change themes. But I have a LOT of editing to do first. For instance, the current theme has a black background, with white text. If I change to a white background, I have to change text color on a couple dozen pages or it will be invisible. I also have layout issues to deal with. So, how can I edit multiple pages over several days, get them all looking right in the new theme, not impact the current site, then switch everything to it all at once?
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