The hexagons are knit in the round, starting from the outside and decreasing toward the center. After the first hex, each new one is starting by casting on + picking up sts of one or more sides of previous hexes. You can make the hexes using whatever method you like best for knitting in the round. I like magic loop, so I simply divided my sts for each hex into two sections. I also dispensed with the markers and wrote out the instructions (by stitch count) for each round. For me stitch markers on something so small just get in my way and slow me down.