If a tick has already attached to you, I'd reccommend seeking out some medical help, but since we're in the outdoors group, what are the chances of there being one nearby? :)

You should:

 - Pour a little bit of spirits on the tick. That should both disinfect the area and stun the bugger a bit.
 - Make a little loop of cotton, and try to pull out the tick, **evenly**.

You should **not**:

 - Squeeze the tick, as doing do could cause it to empty the contents of its stomach, thus releasing the Lyme disease.
 - Leave parts of it inside. Try to get them out at once.

The thing is, if you've got a tick, what you should be concerned about is getting the tick out, without it vomiting. Other than that, seek medical assistance as soon as possible, and keep the tick if possible. It may lessen the need for treatments.