Thank you all so much!
I am going to practice with him a bunch to get him bored with it before I do the doors and stuff then. I have plenty of time and don’t have any trips coming up in the next couple weeks at least. But when he is ready I will do butt bar and then latch the door right behind.
I forgot to mention that once the door is shut, he will back into it trying to get out (sometimes several times) so I know that just because something is behind him doesn’t mean he gives up. The door is nice and sturdy but I’ve got some work to do to get him where he needs to be so I don’t have to worry anymore.
Thank you all again!