Took almost 2 days for me and my wife to assemble, everything went together really good. One person can assemble, but an extra hand does not hurt. Directions were pretty good, but if I had a question there are many videos out on the web to see. I am very impressed with how sound the storage building is once it is completely assembled. I would say the MOST IMPORTANT PART is the BASE, it must be sound, and level. We made a wooden base with 2 x 6 treated lumber, topped by 3/4 4 x 8 treated plywood. If you start with a solid base your assembly will be alot easier.