Saw a guy do an engine overhaul at the side of the road. drop off the passengers, then there and then take the engine apart ( Toyota E20 minibus), replace rings, bearings, seals and water pump, and then put it back together. Sump came off with all the oil still in it, and it went back with the same oil in it ( seems it was still good, it was not totally sludge), and the bus left after 4 hours to go on it's merry way moving passengers again.
Me, I have a liking for many small cardboard boxes, and some larger ones to hold complete assemblies as you take it apart. that also allows you to put the boxes inside the car as you go, making it easy at the end of the day ( or when you call it) to close the door and have all the parts of the engine in a single place, so nothing goes missing overnight. As well you really want to have some cardboard to put bolts in, in a rough drawing done with a marker, so that you can put them back in the same position on assembly, as you often find each position has a different length bolt in it.