I did it this morning.
We (as in my Dad and my husband) butchered our last pig on Friday and after cutting and wrapping all the meat on Saturday, we cut up the excess fat (and that pig? he had some!), put it in the crock pot (and other pots on the wood stove) and melted it down to liquid. This morning I strained the liquid, let it cool a bit and then put it in jars to freeze and be used as needed for baking, etc.