You will be so glad when you figure this out!! I have been knitting for a few years and never had a problem with "extra stitches" and then I did a project with yo's and it took 4 TRIES to get it right!!! I read about the stitch in two books and two online videos and just couldn't get the hang of it! I was so mad at myself for not being able to do what others did by "mistake"!!!
BTW, the knittinghelp video was the one that finally did the trick!! Made it really easy!