Tarp, you just have to go into it with the expectation that you'll get ganked from time to time and you will run into some asshats that will camp you.
However, there are enough of us around that if it's happening, give a shout out and we'll come running. I have no issues with hanging around White Sands/the Undercity or the Ruins to help people quest in peace. I will say however, that the ganking has been kept to a minimum for the most part. People are doing their own thing and having fun. You just need to keep an eye on your surroundings and look for anyone acting shady.
For me, it's been about 95% normal PvE and 5% getting ganked, worried about getting ganked and killing the people that ganked me. Normal for a FFA PvP server is usually around 10 to 15% ganking/random PvP, depending.
As far as TG vs F goes, I can only speak for myself but I don't think those issues should come into play here. There might be some question of who's banner the PvE group forms under (and I would suggest something neutral if at all possible) but outside of that, people just want to play and have fun.
All the other BS doesn't matter unless someone makes it matter. So I wouldn't worry about it in this setting.