Land boarders aren't too much of an issue, depending on the boarder there is as little as a sign maybe a passport check. Obviously the normal rules for flying with kit apply when passing through airports.
There certainly used to be a few issues with Germany I haven't heard anything about it recently, here
is an old post describing some of the issues. Somone local will be best to get you aware of the current state of things.
Your best bet for finding a team for Campaign Cup is one of the European forums the popular English one is http://p8ntballer-forums.com/
. Unfortunately I'm not there this year do to a date screw up on my part