How do I test checkout flow without disrupting sales?

Running an e-commerce store means constantly balancing optimization with maintaining a smooth customer experience. Lately, I've been obsessed with improving my checkout process, but I'm terrified of making changes that could tank my conversion rate. Every tweak feels like a high-stakes gamble. I know my current checkout flow isn't perfect—I see drop-offs, abandoned carts, and I'm pretty sure there are friction points I'm not seeing. But how do I test and improve without risking real revenue? My development team is busy, and I can't afford massive A/B testing infrastructure. I need a method that lets me understand user behavior, identify bottlenecks, and make surgical improvements without turning my store into a testing ground. The stakes are real: every percentage point of conversion matters. My ad spend is already tight, and I can't afford to lose potential customers because of a clunky checkout process. I want insights, not just guesswork. I need a way to peek behind the curtain of my checkout flow that doesn't involve complicated tracking or massive development resources.