Go on Youtube and put in EMT skills. You can find a few good videos there.
Then just practice on a friend. I am sure you got your skill sheets, read them over and over again. Don't over-think it, relax it is not that bad.
After that you can register for your NREMT exam. I would take at least 3 to 4 weeks to review everything. What helped me a lot was to answer questions who are like the questions on the NREMT exam. I think I answer about 2000 questions. There is a lot of books and web sites out there. Some of them are great and some of them are really bad.
Here is what I used and I have to say it helped me a lot.
Books:
Mosby's EMT-B Certification Preparation and Review (great book)
Brady's Success for the EMT (it is not so great but we had the Brady text book so it went hand in hand with it.)
Mosby's EMT-Basic Review—A Case-Based Approach (it is good)
Websites:
http://www.prenhall.com/emtachieve/
I had to pay for it but this web page is awesome, it is almost like the real exam.
This website has a webcast which I listen a lot.
http://www.mediccast.com/
I hope this helps you a bit. Let me know if you have any other questions.B)