I sure do remember. I've been a nurse for 30 years, in the last 6 years I've done agency and traveled. 8 hospitals in 5 years!
Currently learning a new field (utilization management).
Those first two weeks are the hardest. All of the basic material is presented.. then everything builds on that.
I found keeping my questions to a minimum and concentrating on the instruction helped.
Review the material every night at home, keep a mental and written list of what concepts you feel you aren't getting.
I'm assuming you got the dialysis job. That technical application is difficult.. but not as hard as theory.
You can do it... you went to nursing school
, you can do anything!
Good luck, keep us posted.