I am glad to see your chin post. I do roll the razor as I go down the curve of my jawline. I does help to shave the right side of the face with the right hand and the left side with the left hand. I am strongly right side dominant so it was hard for me at first, but it got easier over time and eventually got to be second nature. Ditto for Lynn's skin stretching advice above. Study the direction of hair growth in your beard. When you start shaving ATG you will know which direction that will be.

--------------Scott