We had one late last year and made a heap of money.Mind you we had sooooo much stuff that was brand new in boxes ie wedding gifts and engagement gifts that we hadn't used in 6 years so was time to move it on and put the money towards stuff that we needed. We combined ours with MIL and her brother and sister and we all used different coloured stickers with prices on everything. We all sold the majority of the things we had and the rest got donated to a charity store down the road.

I'd say go for it and see ow you go. Its really not that difficult to organise as long as you have someone else there with you..can get a bit hectic at times especially early in the morning.

Good luck if you decide to do it