I don't think I have really worked on fine motor skills since I was 5. I never did quite master cursive, but I type everything anyway. I play piano and fiddle with dexterity so WHY CAN'T I cut a straight line?
When I first started playing fiddle, it sounded so bad that I played with a practice mute and a clothespin on my bridge so that the noise wasn't so bad.
So I'll stick to this too, and skills will get better. Check the picture out and you'll understand my frustration!