Got the trim on one side installed this morning. Had to run to HD yet again (hopefully last time) to get a miter saw. I got one of the miter saw guide boxes that came with a hand saw for $15. That thing is money. I also ripped up all the trim/baseboard stuff and then cut that to fit after I had the door trim on. I think it came out pretty good. I haven't put any caulking in there yet either but I have that.
@Greenman I definitely noticed what you said and I got it as tight as it can et to the call down there. I probably got like some extra mm's by pressing it as hard in as I could against the wall and firing some nails into it. I could tell it's not as tight as it initially was though, but still very tight.
On the rear side I am not sure what to do. I would have to rip both sides of the trim and I am not sure how to rip them at home with just a circular saw. I was doing cuts with a piece of wood clamped as a guide but it wasn't for anything this narrow. I am not sure how the hell I can do it with something that is like 86" long and 1.75" wide.
I am thinking of maybe just buying some 1" trim at HD that is just like flat wood and using that as the door trim on the inside of the door.
Or does anyone have any pointers on how I can rip these narrow pieces with a circular saw? Here is a pic of the inside.