do lots of research, arm yourself with knowledge, be prepared to advocate for yourself both to be allowed to continue on the VBAC path or to move on to the next option if the VBAC is not progressing/working.
i had a c/s with my first due to a very long labor and failure to progress. that c/s was disastrous, but that was due to other complications (severe pre-e and HELLP syndrome). b/c the c/s went bad due to factors other than it being a surgery, i was approved to attempt a VBAC with my 2nd.
for 3/4 of my 2nd child's pg, it looked like a VBAC wasn't going to be an option b/c he was in a transverse lie for 7ish months. when he flipped head down at 37 weeks, we made a VBAC birth plan in which i stated that if i went into labor on my own before the c/s date we had already scheduled, then i wanted to attempt a VBAC, but to not labor for much more than 12 hours b/c of the long labor and complications i had with my 1st child.
my dr. disregarded my birthplan and all but ignored me for my entire labor. things were not right straight off the bat. i had incredibly strong and close together contractions for 11 hours before i became fully dilated. i was then fully dilated for several hours before they let me start pushing, and in that time, my son did not move down the canal. i pushed for 1.5 hours with no progress, labored down for another hour, and then pushed for another hour...again with no progress. i had started asking for a c/s when the first 30 minutes of pushing did nothing to move my son...i was denied. in the last half hour of pushing, i started having breakthrough pain (had an epi), my BP went low, and my son's HR went high and wouldn't come back down despite them having me flip from side to side. i finally went back for a c/s 17 hours after my labor began, and when they did my skin incision, they found my son's legs sticking out of a hole in my uterus. i had ruptured. my dr. then repaired my rupture incorrectly, causing a problem that later injured my bladder. despite constant blood loss and extreme pain during the time i was in the hospital after the c/s, they gave me a transfusion of 2 units and sent me home 3.5 days after the c/s. 3.5 days after being home, my bladder spontaneously ruptured while i was at home, and i had to be rushed back to the hospital. my OB ignored pages to come see me in the ER for HOURS...when they finally got her to come down, she wrote me off as having pre-e again (b/c my BP was super high and i had fluid around my heart) and told me the pain in my belly was from my uterine rupture opening up again. it was another hour or two before she finally agreed to get me back to an OR...that's when the fun started. as soon as they had me open, they knew this wasn't just a problem with my uterus. they found my insides full of puss, blood, and urine and it took several hours to get it all cleaned out and find that it was my bladder that had ruptured. my recovery was hell. i had to be away from my infant son and toddler daughter for 8 days and was still REALLY out of it and incapacitated for many weeks. i had to wear a urinary catheter for 5 weeks and had to go back to the hospital 3x a week to have things checked/tested. it was a living hell.
now, i do believe that much, if not all, of this drama is due to negligence on the part of my OB. i believe it should have been obvious at about hour 13 that my VBAC wasn't going to happen due to failure to progress.
the success rate for VBACs is 80%. the chances of all the complications i had occuring are very, very low. you might even say that i took care of all the possible VBAC complications for the census of 2008 :-)
whatever you decide, just make sure you are as educated as you can be about the procedure, and advocate for yourself (and ask your partner/doula to do the same...mine did not...fought me every time i asked for a c/s).
good luck!