Even though I can't imagine having to make every landing count with a glider but the one thing I do know is that you have to breath. I solo'd many years ago but the instructor that I was learning with still teases me about my first solo flight. Per his account, I held my breath for five minutes. I know that ain't so, but I do recall his gentle, constant urging to breath.

The best way I found to get rid of the shakes is to go out to the field with one other pilot (you shouldn't fly alone). Hopefully it will be a time of day when no else is there. With just the two of you, fly the wings off of it. If you can remove the spectator factor, you will be able to build your confidence level much faster. Thus the shakes will go away.