The doctors who wait until 42 weeks is because most likely you will go into labor before that. But you should talk to your doctor because some do it at 39 weeks. I personally don't think it should be done before 41+3 but that's just me. If I have to I will wait 10-11 days after my due date. The further along the more ready baby should be. And being in a different position will help with the bigger baby. I have info on that in my journals.
Every doc is different, I was due on yesterday and she still haven't came and my induction is set for mon june 2. My doctor let me pick the day, but everyone different