Ever since the beta first opened I've been playing Guild Wars till roughly the game's release. It had some flaws I couldn't look past and realizing those flaws weren't fixed or changed when the game went live made me lose interest almost immediately. However I booted up the game about a week ago and it seems like a lot of things have changed for the better and I'm actually really enjoying the game now. I have plans to actually continue playing for quite a long time.
Now here is the issue, I want to try and do the Ascalonian Catacombs but I have no idea how exactly dungeons work in this game. I noticed there was an automatic group finder you could queue for which is just fantastic. But... I don't want to be that guy. You know, that guy who drags a group down, doesn't realize how everything works, or sets off things you're not meant to set off. What is expected of me when I join a group for this particular dungeon, and what do I need to prepare in advance before joining? Is there a detailed guide somewhere where I can read up on the dungeon itself?
If it's important, I play a Thief.