Uh, for underarms you might want to stick with CO and skip the BO.
I found that series of videos a long time ago. I've watched them all, will refer back to them sometimes. Hey! I knit Continental style, that weird sort of crochet fashion. Hmph.
Works for me. Whatever gets the stitches on the needle and then off at the appropriate time is the right way to knit. At first I found the English style videos a little hard to follow because I was distracted by the knitting style. Not so much anymore.