Unless you really, really need to use drum mapping..... and chances are you don't.... there's really not a need to do drum mapping to make music.
I started out, heard about drum mapping and wanted to know what it was and how to do it..... however, I found that all the drum synths I had in my DAW and new ones I was getting did not require any sort of mapping and worked perfectly fine as they were with their default installations. At that point, I stopped worrying about drum mapping and just worked on the music.
Of course, that's my opinion. But, from day one to this very day, I have never mapped a single drum.