This has been around a while, but it’s still good.
To be fair to all concerned, Leia has shown no overt signs of a link to the Force. Luke on the other hand has. In his home-built hotrod aircraft, with no formal fighter pilot training and no decent instrumentation, Luke can regularly score centre-hits on 2-metre targets in complicated zero-altitude maneouvres. Until he attends the briefing on Yavin, Luke has no way of knowing that hardened combat pilots would consider that nearly impossible. To him it’s easy. Obi-Wan, who saw Anakin’s performance in the Pod Race, is nervous.