Don't feel like the Lone Ranger on this.. Hypertension also called Stress will do it. Mine so bad I could not trust myself with a Exacto knife in my hand. Could not sign a check if I wanted too.
I even went to a nerve spec. and got a prescription for it. (She called it the pill roller tremors) Which did not fix the problem, just put me to sleep for eight hours.

I even built my own tray, which turned out very nice and helped somewhat.

Finaly I got a airplane that I absoluty hate...guess what you can't crash what you dislike that much. Course if you really want to you can, if you will feel better then it is theropy. Just one of the oddities of this hobby sport.

Have since learned to control where the problem was really at, In my case it was bills and the lack of money.

Once I got my bills under control my shakes went away and I still got that Darn awful airplane. wouldnyakno !

Get yourself a laid back instructor and learn to control the stress. You will crash, so live and learn.

It is bound to happen sooner or later, get back on the merry go round and go again.

You can do this.

Cheers

My home grown tray drawings are below:
All parts are from Home Depot and are alum strap and 1/4" luan ply.
And the elastic straps are from a binocular case as sold at a sporting goods store.