Thanks for all the tips. One more question, do I have to learn how to double clutch?
Don't start trying to pop wheelies just yet...
Like the others said, if you can drive a stick-shift car, you're 80% there. There are several types of manual transmission stick-shift package cars in the UPS fleet (see gear patterns above), and yes the spacing is definitely further apart between gears than on a small sports car.
What may be a little trickier than plain shifting is key use of the emergency/parking brake. During the driver test, you will likely be asked to demonstrate starting the package car on an incline with the emergency brake employed.
Just like the small sports car, starting on an incline or hill in a package car is a little trickier than on flat ground.
It takes longer to explain this than it takes to do it; the e-brake is on, you shift into first gear with the clutch in, and let the clutch out as you drop the e-brake. You need the proper gas/clutch action so you don't stall. If you can do it in the sports car, you can do it in the package car.
Like some others also said, these things are the least of your problems.