There isn't much of a trick to it. You use that little piece of tape to cover the clamp where the lever attaches to the bar. When you reach the lever, just wrap around it. The little piece of tape should cover the gap created if you are careful. When you get two wraps past the lever, stop to inspect your work for gaps.

Edit: Also, when you make the wrap around the lever, the tape kind of makes a V (if that makes any sense) with the small bit of tape filling the middle.