It took me almost a year to get chest hooping down. You just need to practice and not give up. Everyone learns at a different pace. I learned to chest hoop (with arms out) first before I could put my arms in. This way you get the general movement that your upper body needs to do. I've heard a lot of people say they learned to vertical chest hoop first. Also, I found that using a larger heavier hoop was easier to learn with as opposed to lighter hoops.
shoulder hooping took me about a year and a half to finally get. I think that it's good to do it just before going to bed, in my opinion. It seemed to be what did it for me.
I got it vertically before horizontally also.
There's a ton of tips in this thread. The topic is a little more specific, but the tips will still be helpful to you. I posted a video in it as well.