First, there's prep. Lots and lots of prep. Namely, going through 20+ tubs of clothes, shoes, toys, and junk and determining what will be sold, pitched or given away. Your house looks a lot like THIS (times a thousand):
Having some help from your friends, husband, mother, Godmother, and finally sending your kids away will help.
Finally, you toss what's not sold into the truck, drive to Goodwill, and wave cheerily as you go home to your garage, which is now desolate minus a few hundred hangers and post it notes. You count your cash, plop on the couch, and pass out.