Putting this together was pretty straightforward - definitely use the old trick of doing the screws loosely at first and then going back to tighten; that'll help. I did find that when I wanted to switch the wheels to both be on the long side (to fit better in my little utility closet) it threw off the balance of the cart so it became kind of wobbly. Not wobbly enough to pitch things out of the trays, but definitely not smooth. I wanted to use it as shelves which only need to move in certain situations, so I'm okay with a little bit of wobble.