I'm going to be blunt and I hope you don't mind :redface: If you have to convince your caregiver - OB or midwife - that you're having a VBAC you are with the wrong caregiver.
You need to find someone who already believes that vbac is a safer option all things being equal than another caesarean.
If you go with someone that has to be talked into it, the odds are very high that you'll have the rug pulled from under you late in pregnancy or in labour - because you are going to have an already jittery caregiver who doesn't wholeheartedly believe that vbac is safe.
It happens to women all the time - if you want this vbac, you have to seek out people who will fully 100% support you. Not because you've convinced or coerced them into it, but because they already believed before you even walked through their door that VBAC's are ok.
Good luck.