One of the things that has helped me reduce nicks is good skin stretching and holding. Also if your lather is on the wet side it will have more glide. As lather starts to dry if get sticky and then more nicks. Low blade angles also produce less nicks. As far as the hand thing goes, you will either learn to shave with your non dominant hand or not, but don't stress about it. Some do and some don't and both are correct.