My mom had 2 successful VBACs after I was born and both went very smoothly. She said the hardest part was being mentally tough and overcoming the fear of rupturing. I think if your OB is supportive that is half the battle! My advice, if a vaginal birth is something you'd really like to experience, is learn as much as you can about ways to avoid a c-section. Just a few ideas are:
Stay at home as long as you can once labor has started
Avoid induction if possible
Keep moving; don't get confined to bed at the hospital
Don't get an epidural, or if you do, delay it as long as possible
Natural childbirth websites and books will give you lots of great information. Good luck, and I wish you a happy, healthy delivery!