if you are doing it on a box, it could be hard to get a grip. try switch on sw up , making your rotation flow trought the feature . if you want to lurn a real sw up , try it on a rail , way easier to get a grip on a rail . keep your shoulders and hands looking down and bring your hand to your front hip . the last sentence goes for a box too.
opening days are always weird anyways, give you self a chance
sorry for the late reply ,this on slip throu my hands...