(edited by Severim.7938)
Easiest way to setup guild practice?
Yak’s Bend – Bellenisa (Ele), Bellesina (Thief)
Currently, I think finding an empty server works best, but they will be introducing custom server match options soon, so I would say stay tuned.
Jumzi (Ranger), Tarnished Coast
If you have 16 people, that would be ideal. Maybe 2 different guilds. If you can completely fill a map, you can keep outsiders from coming in and messing it up. But, like ayden said, custom servers should be coming very soon which will allow you to do this exact thing (albeit at a cost).
feLIVEar: Your resident forum king.