If you are foundation-less - I say forget that notching thing - waste of time.Gave up on it.
The bees will do what they want, where they want it, and however they want it done.
Heck, once they chewed from the opposite comb side and released a queen from under the cage (took me a while to figure this one out).
So the natural comb (especially fresh comb) has not much of a stopping power from the bees.
If you are on plastic foundation (exactly what Mel D. does - just watch is pics/videos) - then maybe.
The plastic really messes the bees up, IMO.
Bees can not chew through the plastic and so have to resort to life hacks, aka "notches".