First off thanks to everyone who helped me understand this pattern.
I was really happy with the progress I was making until last night when I got to a point in the pattern that I'm not 100% sure about...
So here it is, hopefully someone can tell me if I've understood this properly.
Right sleeve: CO 39 (39, 43, 43, 45) sts. Purl 1 WS row, placing markers (pm) to mark center 13 sts. Work 8 rows in linen st (see Stitch Guide), ending with a WS row. Set-up row: (RS) Knit to m, sl m, p1, work 11 sts in linen st, p1, sl m, knit to end. Work in patt for 3 (3, 3, 5, 5) more rows, ending with a WS row. Inc row: (RS) K1, M1 (see Glossary), work to last st, M1, k1—2 sts inc’d. Cont in patt, rep Inc row every 4 (4, 4, 8, 8)th row 9 (9, 11, 2, 2) times, then every 6 (6, 8, 4, 4)th row 3 (3, 1, 10, 10) time(s), ending with a WS row—65 (65, 69, 69, 71) sts. Work 2 rows even. Piece should measure about 17½ (17½, 17¼, 18½, 18½)" from CO.
So if understand this correctly, my pattern becomes a 4-row pattern, doing an increase row every 4th row 9 times, so 36 rows in total before moving on. Right?
Thanks everyone for your help with this, its my first sweater and I'm trying really hard not to screw it up.