Steve: I recently picked up my Knee Mill, it's a BP cloneish thing and weighs 2200 Lbs.
I had them remove the head which was put in the back of my Ute/Pickup and the main casting went into a 6'x4' single axle trailer.
When I got it home I reversed it into my workshop which has a low roof (cross beams are around the 7' mark).
I used a chain hoist to lower the main body then another to get the head out.
I transferred the head on a trolly to beside the body and using a sheet of 1" thick timber against the side of the body I used the chain hoist to raise the head into position.
I've done it this way a couple of times now and it's been quite easy even on my own.
To move the mill into position I place a sheet of 1/8" thick stainless under one end then use a 6' crow bar as a lever.
Hope this helps in some way but above all else be careful and triple check any slings you're using.