attaching the K & L screws so they would fit securely was a pain. i finally figured out you have to hold and turn both hex wrenches at the same time in order to get them flush. the other, larger pain was getting the J screws in to the shelves. couldn't get enough torque with the hex wrench; thank god it turned out i had a screw driver with the correct sized bit and was finally able to install them. i assembled this myself so that was a large part of my frustration; i'm sure two people would have figured this out much faster. i didn't end up attaching it to the wall because i'm not putting anything heavy on it. on the plus side, this is a lovely bookcase for the money. looks great and is large enough to hold quite a few accessories.