Entering Structures
As pretty much everyone has already said, if you don't absolutely have to enter a structure for an emergency type rescue,...don't. Even well trained teams encounter many problems when trying to employ a tactical response into an unknown environment.
Even if you have a partner, you are relying on a person who may not "have a clue" about building search tactic's. Prior to the Columbine incident, the vast majority of police officers were clueless about entry and rescue tactic's. They did what they were usually trained to do prior to that incident, which was to secure the perimeter and call for the "Tac-Team".
We have since realized that this is not always the best type of response, especially in a "Homicide In Progress" scenario where lives are being lost. Many, if not most agencies have since recognized the need for the "First Responders", (Patrol Officer's), to be trained so that they can be more "pro-active" in stopping the threat.
Still, this is a huge challenge in trying to train "ALL" first responders to act like "Tactically Trained" SWAT Team members. If you have ever worked in Law Enforcement, then you know that not every police officer is "cut out" to be a "Tac-Team" member. I am one of those officer's who would be inclined to make the entry and risk going in to save lives, however many are not so disposed (right or wrong).
Its one of those situations where if you go in and things work out well, your a Hero. If you make that decision and things go bad, you are crucified by the media and your own administration. If you are a civilian and are going to make that type of decision, you are entering into a "Very" dangerous and unpredictable situation.
I know that when it involves "loved Ones" or even strangers, its difficult not to want to help, but if you don't have the training and skills, you might just be adding to the problem. All one can realistically suggest is that you train and shoot in as many different types of situations and scenario's as possible. As Jeff stated, not many civilians are going to get the type of training needed to survive in these types of scenario's, much less enough "on-going" training to maintain the skills.
Good Luck