I don't think you have to remove the handle, actually. Take the plug out that covers the retainer, push retainer block out of the recess in handle loop, loosen, cut to length, retighten retainer, other steps in reverse.
If you installed yourself I would think you would see how to make it shorter. Be careful not to cut off too much, better to do it "part way" of what you think, then use that for a while. Cut too short, and you've ruined it! Duct tape won't fix that one!