Muscle memory will continue to build. That's done by making any moves slowly. It is the same as learning to play a musical instrument. The tendency is to move fast and get frustrated. You can practice using a non sharp butter knife as you set around reading this forum.i'm slowly getting better with dominant/right hand. my non dominant hand/left not so much.
i end up cheating and doing more with right hand.
any tips to improve non dominant hand dexterity?
Yep, this.... I'm very right handed, but after a few cuts, I figured, I'd better figure it out or quit..... I figured it out, not sure if I'm better off or not...I’m very left handed and had the same problem. I just kept at it and it just became normal. Just training muscle memory.
Oh, and I just remembered reading somewhere. More reps of shorter duration causes quicker muscle memory formation. i.e. 60- 1 minute drills throughout the day more effective than 1 - 1 hour drill. So maybe have a butter knife with you to make the motions on your face throughout a day, or "air razor" it. Just a thought.