Make a list
Make a list of everything you need to make packing easy and what needs to go into storage and what doesn't
Have plenty of supplies
Plenty of boxes, plenty of tape, plenty of plastic sealable tubs if you are storing clothes or anything perishable
Or just label the boxes you're storing with what is in them. Color coordinating boxes according to content is effective but if you think you'll be in and out of the boxes you really should label them clearly.