Anyway, the first thing you want to do is make sure you land in unity position. Approach the object like you are going to royale it, and jump into the air. Lock in your strong royale foot solid on the object, and throw the other foot behind. Technically you should do both at the same time, but while you are learning its ok to stagger it a bit. Just like in miszous where the back foot will naturally lock in, the same is true with unities- your back foot will just glide on if your front is in proper position.
Foot position is also crucial.
Before you even try these, stand still on the ground cross-legged so that you can get a feel for the proper stance. Your feet should be at least a foot apart when you land. This is harder than it sounds, because most people tend to jump on very erect with their feet literally touching each other. You need to squat down just like in a royale and make sure you are grinding on the boot. While grinding in this position you have to keep your feet very firm and locked in, other wise you will end up sitting cross legged on the object.