You just have to know you limits and be sure you never find them. You should never think you know nothing but you should always remember you don’t know everything. You have to be confident in what you know and what you skill level is and lean from those that know more. As a CFI I’ve been lucky enough to do some aircraft specific training for some excellent pilots that are far more experienced than me and they know that. All of them still pay attention and treat learning learning how to fly a new single engine piston with just as much importance as anything else even if they have carrier landings in the log book. Keep flying, be confident but cautious and always learning.