I haven't been able to find a guild yet, I have just been doing random runs, and up to Tier 2 that was fine. In Tier 3 I have gotten runs where people want to skip all the enemies because they hit like trucks etc or there are too many, many a group has disbanded over the graveyards, and only once did I get lucky and get seated with a good group that got to the bottom. I may be part of the problem - I only have 2 5 star pieces of equipment. Where can I go to "train" for T3? Run T2 and try to not get hit, ever? Or is it not me and T3 requires coordination beyond "avoid bad stuff and whack things with your sword", which is what T2 was partly with the exception of "use vials on king"?
PS: why is my Blackhawk not dealing piercing damage to beasts or shadow damage to slimes/germlins? It appears to hit for whichever damage type is least effective i.e as piercing vs contructs but not vs beasts.
Play lots of twitchy based shooters, like quake live. Play Demon's Souls for the PS3. Learn to coop with games that are not going to hold your hand for you.
Also, move around a lot. Also do runs by yourself. Doing runs with more people = more difficult enemies.