Has anyone had membranes scraped before?

Melanie
My baby is measuring two weeks ahead right now.  I had a csection with my first and I'm really wanting to vbac with this one.  Since he's big (and healthy!) my dr is going to scrape my membranes at my 36 week appointment to help me go in to labor so I can hopefully vbac and not have him be huge.  Does it hurt?  Will I go into labor that day or within a few days of her doing that? Any tips would be helpful!!