Let me be the first to welcome you to TID.
Before you seal the truck there are a few steps you want to take before hand.
First, does the truck need to be clayed? Chances are, it does. If you are not sure, put your hand inside a plastic baggie and run it across the surface of the paint. If you feel the baggie being grabbed, it is a sign that you need to clay it.
Second step. Inspect the paint for swirls, scratched webbing, or any other paint defect. If there are defects in the paint, you want to polish them out. Are you familiar with the polishing process?
Once you are satisfied with how the paint looks, you can seal it. I love BFWD, and I am sure you will too. You can apply it by hand or machine. Just remember to apply it very thin. You can either apply and remove right away, or wait about 30-45 minutes and then remove (this is what I do).
I hope this helps, and good luck.