Bonneted or Cabover?
Bonneted are easier as the gearstick goes directly into the box. Cabover anything feel a lot more like stirring a bowl of porridge
Should be a 15 or 18 speed. I'd say it's an 18 as they're the most popular these days in most new stuff, and you will probably only use the top 10. The bottom 5 are usually for starting B-Doubles or Road trains.
Timing is esential as a Roadranger has only about 200 rpm between gears.
You'll also find changing down is a lot harder than changing up, over revving is usually the main cause of crunching gears.
If you dont know how to double the clutch pratice on your car -unless the car is auto
after a few years you'll find it's quicker and easier not to use a clutch at all except for initial starting.
Anything else, just holler, I've been praticing doing this for 32 years interstate