1.Cats underfoot and under butt. If I vacate a chair the Snowshoe gets in it. Open plan house so can't ban.
2.Good lighting and decent tools.
3.Instructions that were written by someone who knows how to write coherently. I've seen some instructions that leave you scratching your head.
4. Expunge, erase, exorcise and/or or appease the gremlins who love "murphy's law" or you will have the "quilt from hell" where nothing goes right. Have a seam ripper handy.