Forum:Eridian weapons training

I'm lvl 50 hunter (pt 2,5) and i want to complete all challenges and fully train all weapons. Challenges are easy (only winning 2500 duels can take more time) and weapon training as well. I've got weapon skills fully trained, even launchers but only eridian weapons gives me a problem. Usually I'm training in Eridian Promontory but guardians have too strong shields and eridian weapons aren't trespassing shields. I was trying mod any weapon but i can't understand english tutorials. So where can i train 41 skill levels in shortest time?