get a crane
Karl you'll have to rent a crane and make arrangments for location to remove the mast. They charge by the hour so have everything ready before they get there. Or you can take the boat to a yard and have the work done, or if your in a slip and there is a sailboat on either side of you and they are willing to help you you can rig a anchor line thru a block on their halyard on each side of your boat. Secure the lines around your mast and let them rise to the spreaders. You'll need a lot of help doing this to raise the mast straight up. Good luck.