How do you shape an oval for an oval banneton?

Hello,

I understand the boule and find it user friendly.  However, what do or how do I shape an oval.  I could make it oblong.  However, I believe it would become uneven.  I have searched for videos however I find more for scoring than the shaping.  By the time my bread book arrives. I hope to have used my new banneton.

Warm Regards,

Casey