Welcome to Knitting Help!
The line that you quoted requires 29sts and should leave you with 29sts. There are 5 yo's, 2 skp's and 3 k2tog's so those all balance out. Make sure that you're doing each of the incs and decs correctly. There are videos for each on the Glossary page.
Here's a video for the yarn over after a purl which might be causing a problem. I'd make sure that after each yarn over, you have a loop over the needle and that it doesn't get mixed up with the slipped stitch for example.
Knit, purl, yo, skp
(called single left dec in pattern), k2tog,yo,k,p,p,k8,k2tog,k,yo,p,p,k,yo,skp