My friend was a trimmer all his life.He started out doing cars,but kind of got away from that and did furniture.Assembly line upholstering and on-the-table reupholstering don't even fit in the same sentence.He did the patterning,cutting,and assembling.His wife did all the stitching.He could,but hated it.She hated assembling.She would help assembly on cushions,but not automotive.Stitching only on cars,both cushions and panels.She stitched for years for LB.I think she left there in 1976,when they went off on their own.I've spent many,many hours stripping furniture carefully,so I didn't ruin the panels to use for patterns.Then transfer it to new material,lining up stripes,patterns,color schemes.Then he'd trace and mark,and she would stitch.Then recheck that it actually matched up to the other pieces on the furniture.Not quite like grabbing pre-cut and marked pieces off a pile and stitching the lines together.Transitioning from assembly line work to custom work will take an education.I do think that the workers have a leg up on learning,they do know how to pull,nip,tuck,stretch,etc.already.