It is not difficult or dangerous if done properly. I killed my maim breaker, and installed an extra breaker in the panel. In my case, I just put in a 20amp, as I only have a 3000W gen that only produces 120v. I hung a plug pig tail out of my panel that is connected to the extra 20 amp breaker. I leave this breaker off and turned my main breaker back on. If I loose power, I will open the main breaker, thus not feeding anything back to the utility, close the 20 amp breaker going to the pig tail with a plug on it, and plug the extension cord from the generator into the pig tail. Turn off you a/c breaker so it does not try and come on. You now are powering up your box and you can use your in home plugs and not have to use extension cords to everything. Be sure not to turn on too many things and over load your generator. Best of luck.