@wickenburger, Congratulations on your kidney transplant! At 10 days out of surgery, you are going to be on a high dose of medications. Your transplant doctors will be doing frequent blood tests to establish the dose that your body needs to prevent it from rejecting your new kidney. I had a liver and kidney transplant in 2009, and I still get mild tremors occasionally.

Wickenburger, Here is a discussion in the Transplant Group where transplant recipients are talking about their own experiences tremors after their transplants. I invite you to join us there.
-Tremors post kidney transplant
https://connect.mayoclinic.org/discussion/tremors-post-kidney-transplant/

If you’re taking Prednisone that may be the culprit.
I take mine around noon so I can have the morning without the tremors, sweats and what I call the hyper brain. It makes me feel like I am connected to an electrical outlet!