It does not take a lot. First time, grease it well, then after, wipe off the grease from the ball. This method will distribute the grease up into the coupler well and into areas it might need it. You can always put some up in the coupler also, but I just greased the ball and after first tow, wiped it down. Then applied a thin layer and covered with ball cover.
No grease on legs or pants this way.