If you’re not comfortable “winging it” you might want to look for a pattern, lol, but here is what I would do, if I were going to wing it…
I’d knit a gauge swatch with my yarn and multiply my gauge by the desired hat circumference…so if I was getting 4 stitches per inch, and I wanted the hat to be 20 inches around, I’d cast on 80 stitches. I’d knit whatever kind of edging I desired (ribbing, or stockientte if I wanted a roll-edge hat), then begin the pattern rows:
R1: P2, K6
R2: P2, K6
R3: P2, Cable 1
R4: P2, K6
R5: P2, Cable 2
Cable 1: Move the first 2 knit stitches to a cable needle, and hold to front. Work the next 2 knit stitches, then the 2 from the cable needle. Work the next 2 knit stitches, then p2.
Cable 2: Knit 2 stitches. Then slip the next 2 to the cable needle and hold to back. Knit the next 2, then the 2 off of the cable needle.
Repeat rows 2-5 until it’s the right lenght to begin the descreases…then figure out how to do the decreases… :??
runs off to do some math