A temporary storage space like Storage King is your friend here I reckon. I found when I moved, that I just put everything I wasn't sure about in that space, and only put stuff in the new place that I KNEW I wanted there. The doubtfuls were sorted later and a lot went to next generation family and to charity etc as I just didn't have room for them in the new house. Ended up with the new place having ONLY stuff I wanted to keep. This really really helped my decision making on the other stuff. It also helped that the storage space was just up the road from a Vinnies which dramatically eased the actual disposal. Worth considering as a tactic.