I have a Curve Master foot but find that a quarter inch seam foot works just as well. Align the beginning, hold one piece in each hand, raise the left side slightly, and go. When you're about 1/2" from the end, use sharp tweezers to hold the two pieces together. This takes some practice and coordination but you get the hang of it fairly quickly. It is essential, though, to hold the left (top) piece up. Maybe there's a YouTube that may help you?