The wires in the sump I think... Can't remember.. I think it's to do with oil pressure/level. Leave it attached to the engine.
The engine comes out to the right easiest I think. When you look at the top right engine mount there is a triangular bracket that you remove, as the engine is captive between these 2 mounts. It's easier if you get a grown up to help you, but I've done it twice myself using a trolley jack. Jack the engine up, slide onto the frame. Repostion the jack outside the the frame. Slide engine off frame onto the jack and roll away.
Remove the oil filter and the housing behind it, else it is a bitch to get out of the frame.
I think I worked through the Haynes manual easy enough when I first removed it. Second time I did it all from memory... which as you can tell isn't great.