I wait at least a couple of weeks up to almost fully cured to bevel mine but I have a high liquid oil recipe. I find that I like the soap to have a little resistance when I plane and bevel because then I don't grummy up the planer or peeler too easily and the bevel looks cleaner to me when I do it this way.
I tend to bevel pretty soon after unmolding, mostly because my soap is quite hard and occasionally becomes brittle if I wait too long. I have a beveler, but just like DeeAnna, prefer the potato peeler these days. I used to be pretty bad at it but it does get easier and more uniform with time.
I'm quite intrigued by Irishlass's tool, and am strongly thinking about investing in one, mostly because I also woodwork a bit and it would be cool to have 1 tool for both