I have this serger and love it. The dvd that came with it shows an easier way to do it. It came already threaded out of the box. What it says to do is after you drop this, turn a dial to that etc.. is you leave it threaded with the current thread. Cut it off about 6" from the "t" bar (with the "tail thread" facing you). Tie the new thread onto the one your replacing and pull it through all the twists and turns until you get the the needle. Cut off the old thread and use a needle threader and pull the new thread through the eye. Repeat for the remaining 3 spools. Since most of my sergering is hidden, I keep my machine loaded with two white for the top thread and a grey one and a black for the bottom threads.