I used this to sell some books: Cash4Books.net: Sell Books - Sell Used Books Online - Free Shipping

They pay the postage of shipping. However, they only take like 2-3 of every 20 or so books sometimes, depends on what type books you enjoy. It is kind of fun though at least sorting through your "favorite" or "best" books and seeing if they'll take any. Gets something done and can be "rewarding".

I ended up having something like 33 large bags of books, say 500+ books and I called a book dealer/store owner who came to my house and offered me a price to take them all (and/or to take "some" and deal with all :-) It was only a couple hundred dollars but it solved the problem. The sorting was hard and even when I got here I still had too many books. I'm only now working to get rid of them; there's a book collection box next to the clothes one in a shopping center near me now. I put a 2-3 bags in the back of the car off and on and then go to the shopping center box when out doing chores, etc.

I couldn't deal with my clothes when I moved so I took everything in my closet to the cleaners and picked it all up after I'd moved. Much easier than "packing"/moving it. Yes, it was something like $100 but I had a huge amount of clothes in various states of use and cleanliness (didn't throw anything away ever) and it was worth it to me for the "organization" cleaning did so sorting/giving to charity, etc. was easier in the long run later.

If things get too stressful you could perhaps rent a small storage room for a month or two and deal with sorting it over time; just get things you aren't sure of out of the way and go from there. One thing a friend of mine did was he had to furnish a 2nd apartment when he was working out of town and when that job ended, he had all that furniture so he put that in a storage room and then advertised it from there and someone came to the storage room and bought the whole thing so he got the money and they got the key to the storage room :-) He didn't have to have people come to his home. A lot of places like that have "one month free" or whatever and/or you could take the person who buys to management and switch them over so management knows, etc.