I cant really comment from personal experience - I ended up with emerg c/s after 36 hours labor lol but there is an essential oil you can use on your perineum that will also help prevent tearing, helps to soften the skin for birth etc...

There is some posts I made ages ago in here Herbal Treatments in the Final Weeks
lots of info so I wont re-type it

HTH and good luck with your 2VBAC!!