The wiki on it is actually not bad ^_^ What I do is I really just spend 5 minutes in the shower staring at a fixed spot and just focusing on my breathing I take deliberately large breaths and focuses solely on that. If my mind is distracted or I direct my attention else where I slowly bring my thoughts back to that. You can obviously get far more elaborate with it but this really helps! Don't forget to exercise. We really live in a words which can have a lot of stress some is perceived stress some is actually things which you should stress about. But, the point is, stress is essentially anxiety and similar to fear and this triggers a fight/flight which gets you tense and makes you less relaxed and more hyper aware in essence.
As an example of this, if you go to kill a goat or a cow and it knows you're going to do this it literally makes the meat tougher and gives it a sour taste. The reason for this is adrenaline, it's getting ready to run for it's life. The more primitive parts of your mind haven't got a clue about grid lock or making it to class on time so the higher order minds responds in a way to trigger this "amped" effect.
So you're body is producing this and if you don't burn it off (exercising burns this off) you'll be frazzled all the time! It's actually very scientific if you look into it. As another benefit of exercise you'll be healthier and feel better and you'll also get more endorphin while exercising.
Changing your thoughts to things learning not to get stressed over petty things and being positive and not have a negative inner dialogue will also help immensely!
Good luck to you!
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Edit: Don't forget to get a good amount of rest and also change your diet, sugars and foods that are highly processed will give you a huuge buzz and then follow it up with a giant crash. If you eat right for a few weeks and get over the hump you'll actually begin to dislike the taste of junky processed foods!