I have have a natural, vaginal breech.
The key thing is the position of your baby. Some breech babies cannot be birthed naturally. I had a frank breech (baby folded in half), and that was fine. If your baby is frank breech and you are at term, then a vaginal birth shouldn't be any more complicated than if it were cephalic. The bottom is about the same size as the head.
When you are in labour, it is important that everything is totally natural. You must not accelerate - no induction (incl 'natural') or use synto. If your baby gets stuck and you accelerate, its chin or back of neck gets rammed into your pubic bone and labour will not progress but be very stressful.
If the labour goes well, you will know because it progresses. If it stops, then it is time for a c-section. This is the only time anyone should get involved with your delivery - the saying is 'hands off the breech until the nape is visible'.
Do a google on 'Mary Cronk' and 'breech'. She is an old school midwife, recently retired, who is a wealth of wonderful info on breech. She is one of the true experts in the western world.