I had to move my elderly aunt in a nursing home. How do I go about handling her things?

She was living alone and she has a ton of old furniture, paintings, and collectibles. I can't take them all and she doesn't really care what happens to them. Can I maybe get an appraiser/auctioneer to tell me what her stuff is worth and help me sell it? How do I find one I trust? Thanks in advance for any help.