impossible... you MUST have slammed into at least a FEW trees.
Been running a finger throttle for 5 years now, and every one else I ride with aside from one or two guys all run them as well. Never hit a tree because of it, BUT... in the trees you do have to be aware, or get handguards. I've run without handguards, and about 1/2 of my buddies have them... so not a requirement by any means though.
Takes a day to get used to, CO 2.0 on here is the only person I know who has ever flipped it back after giving it an honest try.
As to what you need... nothing. Just loosen the throttle block & slowly rotate it being careful not to pull out the heater wires. (I run downhill clamp on grips, no heaters, but we usualy do it on the stock sleds without a problem.
You'll find that anyone who runs one will tell you the same thing... more control, plain & simple... not less.