Needing advice for preparing a 3 1/2 year old for circumcision.

We are due to have our second boy at the end of December. Now knowing the full Truth we plan to have both of our boys circumcised together. I am wondering how I should prepare my 3 1/2 year old for this procedure. He has never even been to a Dr that he can remember.

My worry is for him to be scarred emotionally or damage his trust with us as his parents. Above all, Yahs will be done.

Open to all advice, suggestions, and Scripture.

Thank you.