"I don't know how to move through a house, go up/down stairs (can you even survive that?), get through doors, etc. "

i am just going thru old posts on this thread and answering a few points.
in reference to your statement - it would take a LOT of training to do this well. there are tactical teams for law enforcement that focus on just these areas. so ... a lot of time, energy, money would be required.

a more practical approach for most people is to set up a defensive system in your own home. you know the exact layout of your house. intruders do not generally know this. you can decide where is the best place to defend against attackers - if they did make it into your dwelling. you don't need to force them from your home. you just need to make an emergency call and withdraw to a designated Safe Area. work out the firing angles for that defensive zone. install some concealed cameras to give you views (outside and inside) your house. install extra protection in your Safe Area if you want to do this.

this is a more practical and efficient approach. it does not require you to expose yourself to danger ... not as much anyway.

BTW, there are ways of holding a pistol when going through doors and openings. you could learn this in one lesson. but you should learn it.

Pete