Have to ask; is there a good guide anywhere, for idiots who can't get their head around the game's mechanics?

I've played through the Omega storyline and currently working my way through Pandemonium... but I still stink at the gameplay. And whilst the teams do tend to be quite forgiving, I do still feel like I'm a burden to them. I mean, I played the Third Circle and try as I might I just couldn't grasp the mechanics there and, understandably, annoyed one of my teammates. And it's fair to say that I was totally carried through that instance.

I'm admittedly finding it hard to motivate myself with this in mind. I persisted with the MSQ due to how much I enjoyed the story. I guess I could do side-quests, but sooner or later I'd have to play content that requires teaming with other players, and I don't really have any good excuse for being as lousy at the gameplay as I am

I guess I could look for an 'idiot's guide' via Google, but I strongly suspect there'd be a confusing number of links and it's hard to tell which ones keep things simple and which ones don't.