I did not have a footling breech baby (not heard of that distinction before your post), but our 2nd child was carrying breech. My doctor gave us a week for her to turn on her own, but she did not. For that week I spoke to everyone I could about the process of turning her if she didn't turn on her own. I heard horror stories from some ladies... but what I found later was that most of them had waited until LATE to attempt the procedure.
My doc did the procedure about a week and a half prior to my going into labor (she was a week early, so about 2 1/2 weeks before due date?). I had in my head it was going to be extremely painful, etc. I was admitted to the hospital, where the doctor gave me an IV and some medication to stop the very small (I was unaware of them, but they were happening) contractions. Once that kicked in, he gelled up my stomach with the ultrasound gel REALLY heavily, and used his hands to push on my stomach area and manipulate the baby. It was a little uncomfortable, but nothing that took my breath away. My husband was there and held my hand throughout. At its "worst" he stopped and asked how I was doing... I told him it was REALLY REALLY uncomfortable but wasn't too painful as long as it didn't go on forever. He responded by getting the ultrasound back on my stomach and showing me on the screen that she was already turned! It was done, in about 2 minutes or less. He said sometimes it takes a bit longer or is more painful for the mom, but that is more likely when the doctor waits longer. My daughter was only 7'6" at birth so that probably helped. (Already had a son who was 8'12" at birth!). Obviously if anything had gone wrong, we would have done an immediate C-section, but my thoughts were... if we DIDN'T do it, we would DEFINITELY be doing a C-section. My delivery a week or so later was a piece of cake. 2 pushes and she was out.
It was the best decision for us and I am so glad that I didn't refuse the procedure from listening to other people's horror stories. My doctor later told me that a very small percentage of physicians will even attempt the procedure (due to potential law suits IF something should go awry) but that it can be an excellent choice and avoid thousands of unnecessary C-sections. The actual procedure, the turning process itself, literally took about 2 MINUTES. They monitored me for another 2 hours to be sure that the procedure did not cause me to go into early labor (during which I had a fantastic fruit salad from the cafeteria for dinner) and then let me go home.
We had my mom come down to stay with us for the procedure (in case I went into early labor or needed a C-section), to stay with our almost 3 yr old at home.
I'm sure that my daughter's size came into play in my doc's decision to consider the procedure. Do a little research and ask plenty of questions so that you are comfortable with everything and ask for your physician's recommendation (and why he recommends it). Again, my daughter didn't have a leg out, so what happened with me may not apply to your situation.
Also, I was told that in SOME cases the baby can turn back around the other way.. but I don't think that is common. It didn't happen with mine.
Good luck whatever you decide. Blessings to you and your family!