I never send someone to do this job, until they have done at least one with supervision, as when you do get the nuts and bolts off, and start pulling the unit away from the truck, when the studs loose, there is a very awkward moment just as the studs come out, when you will want to be using a wheeled jack to support more weight than can be held at that angle, and the weight will shift to one side. it is a good idea to have someone on the jack and someone pulling and stabilizing the brake assembly.
You may loose some important parts, internal to the gut [hernia possible], or in the extremities [fingers or toes] of the person trying to balance that much weight. be careful your family needs you more than you need to save a few dollars.