im still in the clipper schooling mode and it was getting very boring and very frustrating until i discovered osis.
once you hit this trick you will be in love. you cant do this trick with out having both sides of your clip so after getting somewhat comfortable with clip i suggest to start going for osis after your first set. once you can do at least one weakside set at least a foot above your foot you are not far from hitting osis.
check the osis tips on the board and use that as motivation to school both sides of your clip it works for me