Purge stuff you don't want, don't need and don't think you'll be using in the next 2 years!! We made the mistake of not purging enough stuff and it was awful with all the boxes we ended up with because we first moved into an apartment, then into this current house. The apartment was a 3 bedroom and it was packed with boxes, and a trail to get to each room. A friend thought she could stay with us, until she walked through and saw all those boxes. There was no room.
So purge!