Once you’ve threaded the fishing line, slip on one of the picture hanging hooks. Now you'll need to determine the length of line you'll need: while your helpful buddy supports the bottom of the picture frame, hold the loose end of the line with one hand and the roll with the other hand, and have you buddy move the picture up and down until you've reached the desired height. Raise each hand until it touches the track, allowing the fishing line to tighten or slacken as necessary. This will tell you where to tie your knot.

Trim the fishing line, giving yourself an extra twelve inches of length, just in case you later find you actually want the picture a little lower than you initially thought. Bring the ends together, and tie a firm knot about six inches in. Then tie another one in the same place. Hang the picture hanging hook on the lip of the track, then step back to take a look. If your picture frame is fairly heavy, it’ll probably pull the fishing line down farther than you anticipated; at this point, you can eyeball how much higher you’ll need to take in the length of fishing line, and adjust accordingly. Once you’ve decided you’ve found the perfect height, knot the line three or four times and pop the picture hook back on the track. Now stand back, admire your handiwork, and enjoy your own private little art exhibition in the comfort of your own home.