We are bow training right now, too.
Start with just a grooming band. Do that for a few days or however long it takes for your baby to get used to having her hair in the grooming band. Then move on to small bows & do the same thing. I've found that bows with an alligator clip or barrette on back bothers Lulu b/c it's heavier than the ones that have bands on them. So, I've taken to just using ones with bands.
Also, once I've put the bow it I keep Lulu busy or hold her until she's forgotten about the bow being in. That helps keep her from immediately trying to scoot it out. We're still working though & dont' claim to be experts.
BowBiz has a good video on how to attach a bow. It helped me!