Except for Studebaker's forward-thinking 1936 President, HSA on manual cars didn't go mainstream until decades after the manual transmission itself. The most common technique for proper manual hill starts is the handbrake trick. It's easiest with an old-school lever, and a bit trickier with a button — people still can't seem to agree on how to best use the parking brake on a hill anyway. Either way, stop on the hill, engage the parking brake, and let the car rest. It's less a technique than a rhythm, but it's the one that keeps your clutch and handbrake cable happy long-term.