if you plan on refletching often then i would spend a little money andget a bitzenburger. This thing will hold the arrows and insure accurate vane placment every time.
First use asharp knife, a razor or Zipstrip to remove the fletching from the arrow
Next spread some alcohol on the arrow to make the surface smooth for the vane
Let it dry then put the arrow on the bitzenburger and start gluing the fletching to the arrow. I use ME Fastest Gel glue which seems to work fine

If this is just going to be a one time job then i would suggest takingyour arrowsto your pro shop and have them do it for a small fee