with the new ragnorok now is probably the time to get a wyvern for the first time if you haven't, starting off make getting a pair of bison a priority you should end up with around 3 female bison for the milk thats 3 bison milk every 15 minutes with a baby bison in the vicinity, depending on your rates you might need more bison.

when its time to get an egg tame a few fodder pt's and make some extra spy glasses, tame as many pt's as you think youll need, now use those pt's and head over to the wyvern trench one pt at a time. getting the egg is upto you right through the top or around and in the back lava exit, using the little entrance or exit is pretty safe since the floor is lava and dragons are big, using it to creep in is also safer theres multiple spots for eggs not too far in i would advise waiting for the wyvern to rise and move away from the bottom. get an egg and leave the same way chances are the wyvern will chase you so be fast exit the trench and make sure none made it out. home with the egg hatch it and make sure a baby bison is also ready use the bison milk to feed it and raise it up from there, not having to trap a wyvern for milk and getting to experience the bison. you can also store bison milk in a preserving bin.