Create a “staging” area. Clear one area of the room you want to organize by just moving things out of the way. Use a small table, or stacked boxes to make yourself a surface where you can bring each item to review. Clear a nearby area so you can set up separate spaces for “keep”, “give away”, “toss”. Having a work area like this makes the whole process ten times easier and gives you a sense of accomplishment. If there isn’t room for staging in the area you are working on, create your surface and sorting space in another room.