I've done 100% coconut oil recipes regularly, for my skin though I have to use at least a 30% superfat. But my skin dries out easily. With that much coconut oil, the soap does harden fairly quickly so keep that in mind if you're using any scents that accelerate trace.
As far as the used oil thing. I do know that some people make soap out of used oil just fine. It does have to be cleaned, you can find some videos on Youtube that show how do to that. I don't know if that's the only oil they use in the soap, I would assume not since high heat and repeated heating damages & breaks down the monounsaturated fat in oils and it's the monounsaturated fat that increases an oils shelf-life/stability.
A whisk is okay, but if you plan on making a lot of soap, a stick blender is even better.
_________________ Genny
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