Cops have training, well most don't really have that much, but they do have insurance and a very nice health plan if injured or killed on the job.

Their ability to have backup on hand, flood a neighborhood with patrol cars, and get help if it goes south covers a lot of sins. It is pretty amazing how many police, sheriffs, highway patrol, military police, you name it, can show up on a 'shots fired', 'officer need assistance', 'officer down' call.

In one case officers from no less than five agencies showed up. Inside of ten minutes they had a small army. Kind of a letdown when the guy walked out and laid down on the ground and all those pretty guns got put away unfired.

Wearing body armor also helps.

My biggest worry clearing the house would be a lack of backup, criminals can get very creative under pressure and hide in places you might not have considered, and, because you never know when cops will show up, what happens if cops come in while you're slicing the pie. Cop sees an armed man sighting down a gun taking aim at a friend and ...

A cop who doesn't make his intentions clear, or a command you didn't hear, a frightened and jumpy rookie who gets the 'order to drop gun' and 'shoot at center of mass of non-compliant suspect holding gun' backwards.

A neighbor, or concerned workman, reports 'a burglar with a gun just went in' lines up poorly with you walking out with a gun and things can go sideways fast.

Easiest way to make a doorway more secure, from B&E and hurricane, is to rearrange the door so it opens out. Hinges will need non-removable pins and/or hinge plates that mate. Replacing the door with a commercial duty metal one is good but simply skinning both sides with plywood and/or sheet metal can make all but bombproof.

Taking the door frame out, planing the framing a quarter inch and installing 3-1/4" by 1/4" aluminum plates top to bottom with 3" screws 6" OC spreads impact loads and gives mounting screws a solid grip. The Door frame is reinstalled with 3" screws by pre-drilling into the aluminum. Latches and deadbolts have holes drilled through the aluminum. Between the stops and aluminum you have a door that can't be kicked or pried open. Even a battering ram takes time to get through because they have to break the structural framing to defeat it.

Windows get high impact film and/or Plexiglas screwed to the casing. Bars are cheap and effective. Cactus and thorn bush plantings under windows can do a lot to discourage intruders.

With all this just make sure that you have a way out, and some way for emergency services to get in, in case of fire or other emergency.