Get out 3 bins or laundry baskets. Label with KEEP, TOSS, and DONATE. Start at one end of your pile and begin sorting though the items. Toss them into the corresponding baskets. Turn on some upbeat music and go through this step as quickly as you can. This is not time to be sentimental. Group the supplies that are staying into like goes with like. (Yarn with fabrics, paint with supplies, tools with tools.) This will make it easier to organize and put things away later. PRO TIP: If you're finding it hard to go quickly try using a timer and see how quickly you can get through things in 10 min intervals.