Best thing you can do is follow the guidelines for hatching peafowl eggs for temp and humidity, and make sure they get turned often enough. A lot of people recommend keeping the eggs on their sides and hand turning (as opposed to sticking them in an automatic turner). They are very big eggs (as I'm sure you've seen) so the auto-turners don't always shift them enough to keep embryos from sticking to the shell inside.
If you've never hatched shipped eggs, bear in mind that often times in the summer, incubation can start while they are in the package still. Thus, many people stick the eggs into the incubator immediately upon arrival, rather than letting them "settle" like you would in spring or fall. If you do this, don't turn the eggs for the first day- this allows the air cell to settle into place and allows the chalazae (the spiral bits that suspend the yolk to keep the yolk from getting mashed when the egg moves) time to "unwind" from the stress of shipping. When it comes time to hatch, you may want to be ready to help your chicks... in nature of course it is a bad idea to help a bird hatch from the egg, but there's little natural about shipping eggs and hatching them in incubators. Shipping can (and often does) dislodge some of the membranes and/or the air cell, which can allow a chick to grow too large to turn properly in an egg (thus hindering its ability to pip and/or zip when it hatches). There are also many factors of incubation that can go wrong- for instance, too low of a humidity at hatch time can cause the membranes inside the egg to stick to the chick and basically shrink wrap it in place until it dies.
Do as much reading on the forums as you possibly can, both here in the peafowl section as well as in the egg hatching section and raising chick section. You'll have 28-30 days of incubation time to read and learn.
