Just thinking aloud here...
There are a bunch of posts on adding a rope to the Jib Halyard and using it to help raise the mast. Why not just install the jib while the mast is laying down? Then you could use the jib/halyard to raise the mast once you get it up to your shoulder. Tie it off once it is raised, then install the forestay, back off the jib, raise the main, retighten the jib.
Am I missing anything?
If you're referring to the jib halyard, absolutely. However, you WILL require an 8' extention as the halyard alone is not long enough. Call me crazy, but that's how I raise & lower my mast solo, even though I use a Ausie Halyard for flying the jib. And, having the extra halyard on your mast is not as cumbersome as you might think. All I can say is, "it works for me !!!"
Now, as far as using the jib itself as opposed to the extension is concerned, I personally think that would be a big obstruction. You don't apply any tention on the halyard til the mast has been completely raised by hand. I wouldn't want to take a chance on damaging my jib as there are many things it could get caught on in the process.