Before you attempt a project that uses a tubular peyote stitch graph or pattern, make a few pieces of plain tubular peyote stitch so that you understand how the stitch works. This will make it easier to read the graph or pattern, and if you lose your place, it will also help you figure out where you are in the pattern.
One thing to remember when working in tubular peyote stitch is that when you are working even count tubular peyote stitch (you pick up an even number of beads for the first two rounds) you will make a little "step up" at the end of every round. This makes it easy to keep track of your rounds - you will know you are at the end of one round when you make the step up to the next round.
When you work in odd count tubular peyote stitch, you will pick up an odd number of beads for your first two rounds. When working in odd count tubular peyote stitch, you will not have the "step up" at the end of every round. The beadwork will instead spiral around and around until you have reached the desired length.
This tutorial is for how to read an even count tubular peyote graph, because it is by far the more popular method for working in tubular peyote.