The Feather Artist Club blades are quite sharp. Thus, proper technique is crucial. As has been mentioned by others you have to use a very light pressure when shaving. The blade should contact your skin, but not depress it significantly. Also, keeping the blade angle low will allow the blade to do the job for which it was designed, removing your beard without removing a lot of skin cells. The spine of the razor should barely clear your face.

Also remember that what causes cuts is lateral movement of the blade. You can hold the blade between your thumb and forefinger (with one or the other toughing the sharp edge) without cutting yourself, but as soon as there is lateral movement, blood will flow. Thus, focus on making straight strokes with the razor.

When starting out with a straight razor or shavette, I recommend that you start out shaving only your cheek. With your vision issue, you might even want to stick with one cheek. Shave that with the grain until you are comfortable holding the razor and moving it across your cheek. You can then finish your shave with the DE razor you have used for years.

Once you are comfortable with one cheek, practice with the other cheek until you are comfortable with that one. Even though your might not be able to see quite as well on that side, try to focus on the feel of the razor in your hand and the feel of the blade on your skin. Being able to see what you are doing is not as important as being able to sense what you are doing.

After you can shave both cheeks with confidence, then move on to the more difficult parts of your face: jawline, neck, chin, and stache. Shave with the grain until you are confident in your ability to shave these areas. Only then should you start the process all over learning to shave across the grain and against the grain.

I know you are concerned about needing to shave with your dominant hand only due to your vision. However, you may find that your opposite hand can still be used. When shaving WTG, I shave with the hand on that side of the face. However, when shaving ATG, I find it easier to reverse my grip on the razor and shave with the opposite hand. However, some folks shave with their dominant hand only. Do whatever feels best for you. Learning to use your opposite hand may feel awkward at first, but if you follow the same pattern you used for the initial learning process, you may find that it comes more easily than you think.