Resist the temptation to "zig-zag organize"

When you decide to get a room in order, stay there and try not to get pulled into organizing other rooms while you are putting things away. Before you start, designate and label a box "PUT ELSEWHERE." While organizing, any item that needs to go in another room should be put in the box. When you are 20 minutes away from finishing, zip around the house putting away the items in the "PUT ELSEWHERE" box.