What you will need:
Cutting mat or board
Start out by putting your chunk of soap on its side and cut about 1 inch pieces with your knife. (Sexy Peel was a very soft soap, but some are very hard, so be careful!)
It should look like this:
To store the soap, put it in a plastic Ziploc baggies (three at most) and squeeze out the excess air. Zip it closed and you can remove (if you want) the sticker from the wrapper to identify the soap.
Store your newly cut soap in any kind of drawer or tote.