Good for you man! You bought the best with a Bitz.

1) Changing from 3 to 4 fletch is just a matter of threading in/out the allen screws on the nock index.

2) Strip the fletchings off with a pocket knife or commericial stripping tool, then use a rag and acetone or laquer thinner to strip the crown and cresting. Complete removal may or may not require soaking in a vase full of acetone for a couple of hours. Done this with aluminum arrows.

3) Already taken care of in step 2.

4) Trial and error. Use fletch tape (or any other double stick tape really) to temporarily mount fletchings, but DON'T push down hard on the fletchings to seat them. Put the arrow on your bow to see how they clear your rest, then peel the feathers off and make adjustments as necessary. Use the index marks on the jig for a reference.

5) Have fun!

Here's a few that I've done. From left-right, they include arrows of: white pine (pheasant arrows), western larch, douglass fir, and laminated birch.