Kollel Zichron Ephraim Heschel under the leadership of Rav Binyomin Forst, shlita, and approved by Rav Dovid Feinstein, shlita has produced a very clear poster with images of exactly where and how to cut hair, so as to avoid cutting the wrong section of the peyos. This is a full color poster which the author has made available for people to share, and even print out and post in their own shuls. Highly recommended! Download here.