then do 22 rows of garter stitch for the first three stitches, stockinette for the middle 20, and garter stitch for the last three stitches.
By this, do you mean knit the first 3 and last 3 of every row, regardless of if it's time to knit or purl?
Row 4..knit all the way across
Row 5...knit knit knit purl for 20 knit knit knit
Row 6 knit all the way across
Sorry for all the questions, but this is all new to me!