The shakes are inherent to anyone who's still got the fear of crashing. It's funny - One day my shakes were just gone. I used to watch the rotor disc when learning inverted hovering - it helped to have one thing to key off of. Once you try it a few times, it gets easier. You have to continue practicing it after you have it though, or you can loose it. I was landing nose in a few weeks ago and now it seems I've lost it - I'll have to get back on that. Congrats on nose-in and keep it goin!