Cecily: sorry to hear about your health problems.
Why would a Clem be better for you in this case than the Betty?
I've sold many bikes and frames over the years, and these are some more or less general rules that may or may not help answer your question.
1. If you sell nation wide, the demand and thus the price may well increase. While I hate ebay, I'll suffer it and its fees to get a wider market.
2. Make your FS ad attractive. Photos, adequate technical information, and -- go overboard and be a bit literary. What makes the Betty Foy special? Why should Joe Shmoe in Des Moines or Betty Boop in Austin buy your bike instead of something from XYZ.com for $500 less?
2. You can have FedEx or a local shop pack and ship; I just found out from my local FedEx that they will pack a bike "well" for $25. If you don't trust FedEx, you can have a LBS pack -- again, $25 seems to be our local rate -- and ship yourself. I would not leave it to the LBS to ship, unless they are experienced with economic shipping. I had a very good LBS pack a bike for me, and asked them to ship via their UPS account. UPS wanted some absurd amount -- $275? I forget, but fortunately I was able to rescue the package from UPS and ship it for a far, far better price with Bike Flights.
3. Bike Flights. They are almost holy. Mumble mumble mumble, amen. (I realize that that will make no sense to anyone who wasn't an alter boy parroting memorized Latin responses in the American, pre-Vatican II Catholic Church. But no matter.) Bike Flights is the ne plus ultra of friendly and fairly priced bike/bike bits shipping. They basically buy room with Fed Ex ground, pass on quantity discounts to you, and act as the very humane interface. Get the LBS or whomever to pack, and ask Bike Flights to pick it up from where ever you want it to be picked up from.
The best thing about BF, even better than their proprietary rates, is that when you call their number, you get a real, actual, human being person who actually knows English, who knows what is going on, and who can actually fix your problems.
4. If you have a strong sale, leave it up to the buyer to arrange shipping. A few years ago, I asked a LBS to pack a British Racing Tricycle (like packing a tandem) and ship it to the buyer; I arranged with the buyer to deal directly with the shop. Now the buyer new that shipping a trike would be complicated and expensive, so he was prepared, but I knew the shop and the owner, and I was pretty confident that they would pack well and ship for as reasonable a price as they could. At any rate, I never heard a complaint from either packer or buyer.
5. Lastly, if you can afford to wait for a sale, be prepared to wait if after, testing the waters, no one bites. I've found that demand can vary greatly, and that today's drug on the market can be tomorrow's "must have."