The sump will hold if you have it seated right - it has 4 little 'feet' it sits on. I use a piece of 16mm mdf on my atv lift.
I support the engine and lift the frame off using the engine crane. It's a one man operation this way. The engine doesn't drop straight down, you have to tilt the back end a little first.
The biggest tip for first timer is remember to remove the oil pressure sender off the back of the head BEFORE you separate frame and engine!!