Even after looking at the wiki I'm not sure what direction I move the thumb when doing the TPT, or what amount of pressure to apply.

1. If the toe of the razor is north, and the heel is south: am I moving my thumb north-south or east-west?

2. With the understanding that I am not mashing down, or anything close to it: is it just a light brush across or do I add a bit of pressure? If the latter, does the pressure increase during the movement or remain the same.

I see HHT vids, but since the TPT is supposed to be more useful, it'd be helpful to see a TPT vid or two.