Mark the edge of the circle into 6 even arcs.
Align poles so the thick ends are down. Trim poles to equal lengths. Drill a hole in each pole 62 inches from the bottom. (You'll use these holes when tying the top of the tipi together.)
Hammer a steel rod into inside the base of each pole, leaving about 4 inches protruding from the bottom of the pole. These will act as tent stakes.