I understand the worry you're feeling.

I don't think anyone would hope for a breech birth, but I want to share a positive outcome story of a breech homebirth. Breech is not necessarily a bad thing, especially if you have a proven pelvis(previous vag delivery).
My 4th was a vaginal, footling breech homebirth and my 2nd VBAC. My mw had checked me the day before my due date, because we were suspicious of breech and sure enough she felt feet upon checking me. She scheduled an u/s and external version attempt for the next day, mainly because "I" was not totally comfortable with attempting a footling breech at home. That night, though, I went into labor. It was a fast, easy labor(which made me mistake it for pre-labor), and by the time I finally realized "this is it" I didn't have time to go to the hospital anyway. My baby was born about 15min after the mws got there.
It wasn't any more painful than any of my head down births, and me and baby neither one had any complications. I do remember the mw telling me to push with all my might to get the head out. At the time the pushing phase seemed like it was lasting forever, probably because I was scared of him getting stuck. But, in reality I only pushed a total of 15min, and ds was born totally healthy. He's now a happy, healthy 10yo. My mw says that if breech labor progresses smoothly that often the birth will too, so I guess that held true for me.
Oh, and just a little background. It was only my 2nd vag delivery, and baby weighed 8-2. I'm 5'2" and petite and had previously been told by my ob(after 2nd dd was born by my 2nd c/sec) that my pelvis was only big enough to birth a 5lbs baby. Right.. Each of my VBAC babies have been over 8lbs with the biggest being over 9lbs, and I've never torn or had to push longer than 15min with the exception of my first VBAC and I pushed 1 1/2hr with her which is normal for a first time vaginal birth.
Best wishes to you, and I hope hearing a positive story will help ease your mind a little.