When my mother passed away and I was in charge of her estate sale, I consulted the yellow pages.
I hired an estate sales company to come in and do all the work, and I don't regret it a bit.
I would, however, ensure that any seriously valuable (and "pocket-able") items are within your view at all times, as we had quite a turnout, and some expensive goodies got lifted.
If memory serves, they kept 10%. It was worth it to be rid of the headache, in my opinion. Just don't expect to get the actual value of the items - I was disappointed at some of their prices, and told them as much. For example, my mother had hired a company to build her a special china cabinet - she paid $7,000 to have this thing built. They put a $200 price tag on it, so I bought it!! I would say that the entire house full of stuff was probably worth about $40-50,000, and we got $24,000 out of it.
As for eBay, my hubby's quite the expert, but I can say a few things about my own experiences.
I've sold some collectibles on eBay, and got about what I expected. It was a pain, though - having to box stuff up and ship it off, all to different addresses. They have lots of help screens to get you going, and can explain it a lot better than I can.
Good luck, Robin! Miss you!