There is a huge fatigue factor. I'm a beginner, and I'm more tense than I wish I were. I don't have the muscle memory yet, though I can tell it is improving. I work very slowly, so I spend more time tensed up per pattern repeat than when working faster. Do I want to speed up? Certainly! I'm just in no rush to do so. I'd rather practice accuracy slowly than disaster at high speed.
- Repositioning my hands very frequently helps.
- Making sure that the quilt is not falling off the table helps.
- Planning ahead so I don't have to sew accurately 'backwards' helps.
- Working in short sessions with significant breaks between them helps.