Negative pressure or being tentative is not a good thing. You do not want to press hard either because of the possibility of getting a nick or some definite razor burn. I would start with just one side of your face and work from the sideburn to the jaw using light pressure and less than a 30 degree angle. You want the razor more vertical, but not with the spine touching your face. Short little strokes and a little longer strokes to clean up. Don't shave any further until you get comfortable shaving that part of the face and then move on in small sections like the cheek next same side, then the other sideburn to jaw and cheek, then neck and chin last.

That razor is a very nice shaver.

Good luck.