Scaling up vs. risk management - how do you balance?

Been trying to move past micro-positions and actually see some decent returns, but every time I increase my capital per trade, my psychological edge seems to falter. I start overthinking entries, second-guessing exits, and my win rate dips. It's like I understand the theory of proper risk sizing, but the application with real money feels completely different. Those small losses on larger positions feel much more significant, even if they're still within my pre-defined risk parameters. How do you guys manage that mental shift when you start trading larger size? Is it just pure repetition until it feels normal, or are there specific strategies you use to desensitize yourself to the increased capital at risk?