The last three temps 10am/10pm yesterday & 10am today are all at ~98.8. Brought her to the vet today (day 60) for xrays. Three pups

yay ... All large pups

Kinda yay, kinda not ... All breach

dang!!!
I was hoping that my first (and hers) whelping would be the easy type. Now I'm stressed and a little worried about my girl.
Any suggestions and advise on breaches will be greatly appreciated. My mentor told me to be extremely careful of the abdomen if I need to gently pull if/when the head gets stuck. Also to apply a little KY and gently pull only during contraction. Question - How long would you leave a pup in this postion before getiing concerned?
I do know one thing, it'll not take much for me to jump the gun and get her to the vet.
Aloha