The fact that your having these feelings I think shows that you are approaching flying with completely the right attitude. A PPL should NOT make you super-confident and think you know it all! Remember, the day you go flying and don't learn something new is the day you've become complacent.
Just take things at your own pace. If in doubt ask! Either ATC if flying, or an instructor or fellow pilots on the ground. There is no such thing as a silly question.