This chair is somewhat easy to assemble. There are no written instructions, just pictures. On the step to insert wheels in the bottom round frame, it shows you that you place the wheels in holes meant for them. I suggest you use a hammer covered in a cloth (saves wheel casing from scratches) and tap the wheel into the hole. Difficult to properly place pin of wheel in hole by hand. The chair mechanism operates easily for height adjustment. The reason for the 4 stars is that the mesh for the backrest of my chair is blush, the seat to my chair is an obvious peach color. Very noticeable. Will keep it to save the trouble of sending it back, but be aware of color variables.