I'm always nervous until I get in and start the checks.
Is it good? It's certainly better than getting complacent or over-confident. Nowadays I just kind of accept it and see it as my mind doing its usual routine tricks. Same as when it tells me, every morning, that getting up is awful and terrible and I really need another three hours sleep. I get up, and feel fine. Similarly, I get in the aircraft, and remember how to fly. So I let this silly mind run on, and don't listen.