DO: keep yourself stocked up with reagents, water and ammo where appropriate, you don't want to be there at the beginning or halfway through a boss fight missing something vital
DON'T: assume you having a hissy fit and dropping group will make a difference, every time this has happened we've found a replacement and had a fantastic run.
DO: take a few seconds to say hello at the beginning and goodbye at the end, it doesn't take much but just helps remember you're playing with other people.
DON'T: be afraid of the Occulus. Yes it's very different to all the other instances with the vehicle mechanics but even in completely random pugs we're able to complete 'Make it Count'
DO: be prepared to wait for a group if you're dps. This might have just been my experience but it can't take a while for the group to form, which means there's plenty of time to get dailies and quests done.
DON'T: be disheartened if there's a wipe. Playing the blame game doesn't help anyone and there is still room within the game for there to be a random happenstance which gets everyone killed.
If you haven't played around with with the random dungeon finder then at least give it a go once, especially as it should be a fairly painless way to get a couple of frost emblems.