Having worked in a funeral home myself, I'm generally familiar with the process as well.
In the case of bodies that have been autopsied, the embalming process is more, shall we say...intrusive. The breast plate is removed (it's just lying in place, having been cut out during the autopsy) and the Hefty Bag containing the kibbles and bits that used to be the deceased's organs (cut into what is essentially cube steak) is removed, drained of excess fluids, and then partly refilled by pouring embalming fluid directly into the bag. The bag is set aside and with the chest cavity left wide open, the embalmer reaches inside and manually connects the embalming fluid hose to the major arteries that supplied the arms, legs, head, and whatnot. If a cranial autopsy was performed, the mortician doesn't go back inside the skull since the embalming fluid will get into the skull well enough via the veins in the neck.
Excess fluid is drained out, the Hefty Bag-O-Guts is opened, and the contents poured into the chest cavity and distributed evenly. The chest plate is then sewn in place.
Oh...since an autopsy victim's anus and other openings are disconnected, they may be glued, sutured, or plugged (from either the inside or the outside) to seal them off against fluid leakage.
In Florida, at least, embalming isn't required by law. Jewish custom technically forbids it, and having dealt with a Jewish funeral an an unembalmed body, I can assure you that the reason Jewish funerals are held as rapidly as they are is because of the smell. Count on a funeral the very next day after the funeral home gets the body if it's to be fully compliant with Jewish tradition. I've caught a whiff of decomposing body coming from the casket. It didn't make me hungry.
One thing about that job is that it taught me I can handle just about anything. My stomach is far more rugged than even I imagined it would be. And my view on death has become pretty mild. It certainly doesn't freak me out.
CJ
CJ