What is the best technique to use when shaving? Should you hold the razor in the same hand whilst shaving or swap hands depending on which side of the face you are shaving?

I am right handed, and I currently hold the razor in my right hand when shaving (using the left to stretch the skin). I struggle to see in the mirror when I shave the left cheek. I have tried holding the razor in the left hand and have felt a little uneasy. What habit should a beginner get into when shaving?