what's the best way to emulate pro-style handwrapping?

Those leroy bandgages are only 5.5 yards long. You can use them, but if you are trying to get as much protection as you can you will want something like this.

http://www.ringside.com/Ringside-Super-Gauze-Box-of-50-Rolls/productinfo/GAUZE+2/

 

Maybe wrap them like in this video, then use masking tape (the type that a decorator uses to cover bits that he doesn't want to paint) in strips in between the fingers, then circuits of masking tape around the knuckle and palm. The masking tape is a cheaper alternative to the medical tape that our well-paid idols use!

Wrapping your hands for boxing

 

I recommend using two Leroy bandages on each hand if you choose that

 

Nacho Berstien's stars all use Leroy bandages in fights and the gym!