You can use any method you want to knit in the round. For the 84 sts you'll have you probably want a 16" needle, but you can use a longer one with the magic loop or single loop method. When she talks abouth 'switching' the first and last st, she means swap them. Put the first st from the L needle onto the R needle and the end st from the R needle to the L needle, crossing them over. You can also CO 1 extra and k2tog to snug them up, or just knit the first st off the L needle.
sue- knitting heretic