Yeah, see if you can find someone trustworthy. It helps to make you an all around better rider. When I took my first riding lessons I didn't even know you could post, let alone what that was. So I thought that everyone rode at the sitting trot.
One day another rider was in the ring and was posting, I couldn't help but laugh thinking "what is she doing?" then my trainer had to break it to me.. >_> she told me about the sitting trot. I thought it was so easy and I was mad she didn't teach me it before. Now I'm glad she did.