If they already have a working knowledge of the motorcycle, they shouldn't need a whole lot of banter about the Valkyrie. A good sign is if they roll up on a cycle, the larger the better. I'd make sure that they straddle and sit on it for a little while to see it they can place both feet on the ground with kickstand up.
If not, I'd tell them that I'd be more comfortable with me driving and them on the back for a test ride.
No newbies, no teenagers, no cowboys (unless they are on horseback). Mature riders only. When I bought my Interstate, that's how I approached the seller with all seriousness and intent to assure him that my experience and maturity preceded the ride/inspection; then the give & take conversation over the asking price. Worked out great for he and I.
If they are dazzled after that test ride and want to strike a deal, I'd inform them that there is a whole website filled with people who have technical and mechanical savvy about this machine. That they already have this at their disposal for routine maintenance and repair should they desire it.
Here in Colorado, for an instate transfer of ownership you can sign over your title right then and there with a signature, date, and mileage of the vehicle right on the back side of the vehicle information; just so long as you are paid in full it's pretty simple. A bill of sale with a copy for both parties.
Different places, different laws. Check with your DMV (in person or online) about transfer and who assumes responsibility once the title is handed over to the new owner.
You want cash and no empty promises; sell it when you feel right about it and get a good price that meets what you know your ride is worth. Be kind, but be steadfast. Experience leads me to believe that the winter is good for buyers; the spring for sellers, when it comes to dealin'. Best wishes to you, sir.
But you already knew all of this.
