How to steal eggs is calm way:

I found out that by taking maewing and going slowly (little bit faster than wyvern ofc) from beging to end of trench, you can lure out wyverns away from spots with nests. Then taking egg doesn't really anger any wyvern that are far away from cave. So then I go around to the beging of cave, switch to Argentavis and peacefully scavange for nests. If any wyveen is left, its easy kill with Nett Launcher (possible milk harvest) because they are alone.

Still I die quite often there but it is what it is : )

Good luck

More Wyvern Taming & KO Tips