My first attempt at making my own soap a few years ago did not go very well, the reason being that I used the wrong sort of base. I used a soap base with a moisturiser in it, and it all just lathered up into a bit of a mess.
I have now re-educated myself in soap making. The important thing is the base, it needs to be a plain unscented glycerine soap. I searched the shops and found glycerine soap and unscented soap, but unscented glycerine soap? Nope.