Deck stepped or keel stepped? Makes a difference in how much you need to lift the mast.
Deck stepped, just a couple of inches and you can lay it down again.. keel stepped you need to lift cleanly straight up 5-6 feet or so, before you can lay the mast down.
It's fairly straightforward, loosen the rigging, disconnect any electricals, have the cotter pins out except the last few, support the mast with the crane and remove the remaing stays, bringing them to the mast and securing them there. Lift the mast by a well balanced point (typically under the spreaders for a single spreader deck stepped mast - watch for light fixtures etc) If your lift point is close to the balance point it's easy to control the ends.
Keep an eye out for the crane hook/ball against the mast (pad it with carpet etc) and be wary of damaging your windex/windvanes (remove ahead of time to be sure). Extra lines/halyards at either end will help you control the mast if you're doing some of this in the air.
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"