I did VBAC after my first born was c-section. This was 8 years before my j-pouch surgery. had I known a j-pouch was in my future, I probably would not have done it, but that was back in 1987, when VBAC was all the rage. Nowadaysit is not recommended, as c-section is now safer for both mom and babe than VBAC.
First born was under 8 pounds, but was breech, so that was the reason for the section. Baby #2 was nearly 10 pounds. Labor stalled in the final stage and outlet forceps were needed. Long story short, I wound up with 4th degree lacerations. They healed fine, but I now have pretty serious rectocele and cystocele. No significant incontinence yet (28 years later), but I do have concerns as I age.
Do what you gotta do, but be sure to be prepared to switch to a c-section, as there are many obstetrical reasons for it that can come up at the spur of the moment. Lots of women here have had successful vaginal births after j-pouch surgery.