It takes me about 10 minutes, and it's complicated the first few times. I got a hang of it now. The trick is to hold the mounting-bar and the belt in one grip by the right hand, while you tighten the belt with the left. I tighten loosely to leave some room to move up and down, so that I position it to my desired height. After that I tighten it more. I attach the table, slightly adjust the mounting bar so that the table is horizontal. Then I use a wrench to tighten to the maximum. After that I extend the side locks, so that the table doesn't wiggle side to side.