subbing in my kids class tomorrow

So, yes, my second grader's teacher is out tomorrow and she said "awh I bet he would love to have you in our class". He is 7 and welllll he is actually embarrassed lol or he thinks he will be. That's just him he is the kind of kid that likes things the way they are. He deals with change of course and over comes it but he worries a lot before hand.

Anyways! If any of you have subbed in your kids class or if you just have any advice in general I'd love to hear some tips and tricks!

I am super excited because I love my job and I love my kid, I'm getting the best of both worlds tomorrow! I'm not worried like he is I just figured if there is any advice out there I'd love to hear it.