The directions are clear with pictures for clarification and written instructions. It is definitely a two person job; works best if  both can listen to the others suggestions or ideas if there is any confusion. Concrete would be easier, although we used 3/4 plywood. The time and temperature of day and area you install it in can effect the number of days it takes complete it. It took us two days in the direct sun, midmorning starting time, 4 to 5 hours both days.