Latissumus flap questions...surgery scheduled

Hi,I am new on this site although I am 5 years out from my diagnosis of DCIS.  I had 2 lumpectomies in the same spot which have left me uneven, followed by radiation.  I learned insurance will pay to make women even after breast cancer surgery.  I have seen a plastic surgeon who wants to do a latissimus flap, and although I have scheduled the surgery, I need to hear from someone who has experienced this surgery about what to expect. I am nervous about it the more I think about it because it seems so major.  

Please help me know what to expect.

Thank you so much!