i would go "all-at-once". i pulled absolutely everything and anything from our cupboards (and placed it all over the floor in our apartment!) and set myself on a mission to de-clutter ourselves of things we don't need and don't use. i am going through every single item to make sure i don't miss a thing.
i set up one big box for the salvation army and one box for things to be returned to department stores for refunds/store credit. there are various little bags made up of things that have to go to certain places (MIL, SIL, local pharmacy etc).
i also made a list of all the things i wanted to get done and are ticking off each and every one, as i do them. it helps me to stay on track and get things done rather than feeling hopeless about it all.
we have SO MUCH crap and sorting out to do, that i took photos of our place with the current mess and are considering putting it up here in my own thread with before and after photos. :LOL
there are only a couple (literally) of things i am selling on ebay. to me, selling everything i don't want is going to be a long and tedious process and i really don't have the patience/mental capability right now for it all. everything is being handed out to goodwill/family/friends that want it.
we are moving next thursday into our brand spankin' new home and i only want to surround myself with the things i really want. so i am going full force here with the de-cluttering since i have a deadline.
deadlines are good.