Nimble Fingers

Crack a Very Hard lock, the toughest tier. You'll need decent Thievery and a Craftsmanship boost helps - build the skill up on easier locks first, since your level caps which locks are even attemptable. Very Hard locks sit on well-off houses and shop chests (best approached at night when nobody's watching). Bring plenty of lockpicks, take it slow on the pick-turn, and save first. Not missable - these locks are all over the world.