I'd have to say I disagree with not running with guildies. For the most part, won't they be the ones with the most patience? Or shouldn't they? They can go hard on you, outgear and out threat you all night and you can just strive to get better just as or more effectively, cause you won't have people bailing on you for one.
Practice, time and experience will give you the confidence. I'm always nervous going into a new situation, only on raids now, with people who are counting on me to hold aggro and stay alive and whom I don't know. Why? Mainly, I just want to do the pro job that I normally do. I take pride in that. I know my rotation, the fight(hopefully), and know how to handle situations when things don't go quite right.
Knowing your rotation is one of the most important parts. You need to build threat fast and maintain it. This will hold aggro the best. As you get better gear, it will become bigger naturally, but knowing what buttons to push when, is huge. When you do it right, there isn't much that can overtake you and I've tanked plenty of instances where dps way outgeared me. Not to say they never pulled it or don't come close. I still have plenty of scares from real high dps, but for the most part, in heroics, if they do pull aggro, it's because they are about to die anyway.
Knowledge of fights, not just your rotation, is important too. Take my first Gen Vezax. I was OT. Never got to void walker in time and caused wipe. Spawned too far away from where I was, knew I was going to tank him, but wasn't central to boss to pick him up. That's inexperience. I knew he was coming but not from where, now that I knew. Second time doing it we got the hard mode acheivement. (I think it's HM ach)
Anyway, you can get all the knowledge from these forums/videos to go into a battle with that knowledge and that can help you relax too.
Once you have the rotation down and you have some experience with your setup and UI and you know the fight (cause knowing is half the battle) you should be able to relax enough to perform your job competently enough for the group to be succesful.
Other than that, f@&$ em if they can't take a joke!

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