If you don't have a huge amount of experience with manual transmissions and larger trucks, you may want to head out of town to a fairground or a large open field (with the owners permission) and practice backing and manuevering around obstacles (plastic garbage cans make great obstacles!)
The deuce is not hard to drive, although some have a little trouble getting used to the 4th/5th gear pattern. Backing with mirrors is a bit harder. I have been driving larger trucks my whole life, so I was used to it. Get the mirrors adjusted to suit your driving position in the seat. I leave mine a tad low so I can see the edge of the rear body. When I was learning how to drive trucks, an old timer told me that more accidents occur when backing up than any other time. Next was following too closely, truck brakes are slower to react than modern car systems, and heavier vehicles have longer stopping distances. You definately want to drive the deuce defensively!
Have fun with your new toy!