HI Stephen
welcome aboard.
can't help with members in your area I am afraid, but no doubt someone will be along who can.
One of the guys from the board (Nige) has a site with some excellent Gamo info and mods that can be done.
see http://www.postcardfromspain.com/airgunclub.htm
best tip...practice, practice, practice!
It does work.
Try to cock the gun slighty away from your body as it is easy to trap part of yourself in it!
Cheers
Graeme