I've only just seen this thread. After finishing a moto type jacket all it needs is the snaps. I initially bought the little Pyrm pack with the snap size I wanted and the tool. First attempt I couldn't even get the hole using three pieces of my fabric to represent back and front and the interfacing. When I eventually got the hole (using a hammer) I then had trouble with the first back snap.
I looked at different videos and eventually found this video, which although in German, visually was better on what went where, which was where I was going wrong.
https://www.youtube.com/watch?v=p6yhNkaMW4YI did my test one and it worked perfectly. Then I realised that my tool wouldn't work for the back one because it was too far away and there was too much fabric, so ordered the plier set with extras (Jaycotts) but that wouldn't work either so gone for the tripod for the back piece (only £4 and free delivery on Amazon).
Only extra problem I have is that DH came upstairs when I was hammering, what are you doing etc. Wanted to do it, I was still on the sorting out what went where and didn't want him around.
So now when I'm ready to roll I've got to wait while he out of the way so I can hammer in peace.