I've cleared rooms and buildings in Iraq. Even with a trained squad of MPs or infantry, and backup on heavy weapons outside, clearing a building is a dicey affair. (You don't want to know what it was like with half-trained tankers playing at being infantry...)
Doing it by yourself, half-awake in the dark? Not unless my wife's life depended on it.
I am a Soldier. I fight where I'm told, and I win where I fight."
GEN George S. Patton, Jr.