Thanks for the advice guys, much appreciated. The halyards are external to the mast. I like the idea of using the jib as a safety line, I have no idea how old the halyards are and makes me a little nervous going up. It probably is a good time to replace the lines.
Is dropping the mast really that easy? I hadn't considered it.
If you have external halyards, just fish the halyard over the sheave. And pull out the forward side of the mast.
It looks like the main sheave is on the stern side of the mast. I would have assumed I feed it up through the forward side of the sheave and pull it down on the stern side of the sheave. Is that correct?