Like thebigspendur said, you will learn to shave mostly by feel.

I am nearly blind in my right eye because of a detached retina and 2 subsequent surgeries. It took me a little while to learn to trust myself with a straight razor, but once you get a feel for it, shaving will become second nature.

Practicing with your shavette without a blade would be a great way to learn the touch necessary to shave with a straight razor.