Reversing a pattern

Hi-- I’m working on a blanket that uses the Lace and Fans pattern from Leisure Arts.

I want to reverse the pattern half way through my blanket. I tried knitting the pattern backwards, but it doesn’t look right. Can someone please explain what I need to do to make it look like a mirror image?

Here’s the pattern:
Multiple of 15sts +1
Row 1 (right side): K1, YO, K1, P4, P2 tog twice, P4, K1, *(YO, K1) twice, P4, P2 tog twice, P4, K1; repeat from * across to last st, YO, K1.
Row 2: Purl across.
Row 3: K1, *YO, K2, P3, P2 tog twice, P3, K2, YO, K1; repeat from * across.
Row 4: Purl across.
Row 5: K1, *YO, K3, P2, P2 tog twice, P2, K3, YO, K1; repeat from * across.
Row 6: Purl across.
Row 7: K1, *YO, K4, P1, P2 tog twice, P1, K4, YO, K1; repeat from * across.
Row 8: Purl across.
Row 9: K1, *YO, K5, P2 tog twice, K5, YO, K1; repeat from * across.
Row 10: Purl across.
Repeat Rows 1-10 for pattern.

knit two lenths and graft them together; or start w/ a provisional cast on and work our from the center