In the same situation, my wife requested I downsize the collection -- and still underway! I've used both EE and floridaguntrader [FGT]. EE works for more expensive items, especially if you find a local dealer that ships for "reasonable" amount. Also, likely going to use EE for things like my Sig 229 preban .40 -- nobody wants .40 guns anymore, and more likely a market for it in certain states. The local dealer is a small shop and will ship between $25 and $50, depending on insurance, whether rifle or handgun, weight, etc, and they will box it up if I want. For me to ship a rifle would be $25-$30, so I don't mind the extra for something maybe $700 or higher and for handguns that UPS and Fedex won't ship for private people except overnight.
Used FGT for a number of sales and trades too. All the actual transactions went fine, several of the email/cell "discussions" were terminated by me because they were definitely not comfortable. If they don't want to do a bill-of-sale, or won't provide proper ID [minimum FL DL long guns and both DL & CWL for handguns] -- no deal/transactions. FGT has a detailed Bill-of-Sale form that you can print out. I like to meet at gun shops/ranges, places that sell guns like Rural King, Cabela's, Wal-mart since it is less likely that an accidental sighting of a gun while inspecting will be considered scary. But also have met at gas station-mini marts, lots of people and activity so you don't stand out, well-lit, etc. Once things appear set, exchange cell numbers and descriptions of vehicles once the meeting is set.