oldie but newbie here ...AL question

I have been an LPN for 13 years working mostly in various Dr's offices.
My only other experience has been a few months on the floor of a small community hospital directly after I got out of school.
I am now working in an urgent care facility sometimes up to 15 hrs a day.
I am exhausted from the long hours and honestly just want to try something new.
So, today I got hired in for part-time on 3-11 shift in a 26 bed AL center.
Apparently most all the residents have alzheimers or dementia.
I started today with viewing a series of educational videos and will finish those on Wed. Then I start on the floor with orientation.
Now, I am starting to freak a little bit. I have never been in a supervisory position and no experience in NH/AL. What was I thinking ? LOL
The DON told me that they don't do IV's or G tubes, cathters ect, so that made me feel a little better. I will have 4 nursing assistants and I will be the only nurse on the shift.
For those with experience....have I bitten off more than I can chew ?
I am trying to stay positive. Both my parents are very ill and are nursing home patients, so I wonder if I have romantizied the notion of making a real difference to someone else ?
I have really enjoyed reading the boards here and looking forward to contributing ...
Thank you in advance.