That's primarily why the program (and Starting Strength) preaches starting at the minimum weight possible (usually just the 45lb bar) for each exercise, even if

That's primarily why the program (and Starting Strength) preaches starting at the minimum weight possible (usually just the 45lb bar) for each exercise, even if you're confident you can do more. This way you start at the bottom at each exercise, focus on getting your form right first, and then start stacking up weights. Better to take some time getting to lifting heavier things than to rush and make a mistake.