Obviously you are too far away for my vet. I used to have aviary birds - parrot, cockatiel, American and English Budgerigars, and now have chickens. What I did before we got our chickens was to find a vet that would see poultry. Most vets won't see poultry but if you find one that is listed as treating dogs/cats/birds/exotics they will see ducks and chickens. My vet even sees turtles and guinea pigs and does surgeries. He had to amputate a Leghorn wing last I heard.
Line up a vet in advance so that when an emergency occurs which is something you can't diagnose or handle, you will know who to contact in that emergency. I had a vet lined up for 10 years and never had to go to him with my aviary birds but one day an emergency with my ill Silkie occurred and he took me immediately to see her. With chickens a 2-day wait for a vet can be fatal. You need to find one that will see you the same day for an emergency. Chicks can't wait 2 days to see a vet since they are so delicate as babies.
If you are in a rural location it may take an hour's drive or more to see a vet that treats poultry but it will be worth it to have him/her lined up in advance. I've had advice from well-meaning BYC friends about maladies with my birds and was alarmed at the flood of different advice and scary diagnoses. That's when I determined a vet would be my best resource since so many chicken problems can show the same exact symptoms -- sometimes a correct diagnosis can only be made by a medical professional. Of course, as a last resort some owners just cull their problem chicks/juveniles rather than paying the vet fees. It's all a matter of personal choice.