Summarize the following:
You want to practice getting your horse accustomed to strange things like trailers and halters before you have a problem where you need to get your horse trailered quickly. Make sure that your horse is accustomed to being handled by people other than you. In the event of an emergency you might have to leave the care of your horse to someone else. You want to know who exactly you need to contact if there is a problem (your horse is sick, your barn is on fire, those types of things). Knowing the layout of your area (such as your farm) makes it easy to direct emergency responders to the area of crisis and means you know exactly where to move your horse or horses in the event of an emergency (such as a fire). You want to be in contact with the people who might be able to help if something goes wrong and who can disseminate information in a quick manner.  This can help spread information quickly, especially of things like infections and diseases being spread among the horse population. Get helping hands when needed. The more people you have on your contact list, the more people will be able to get to you quickly if you need helping hands. You absolutely do not want to have to go digging through your records to find your vet's phone number when your horse is having a crisis.  Make sure that you have your equine veterinary records in a safe, but available place. Always keep the phone numbers for your vet, and for emergency services, and so on in a handy and easily accessible place.
Accustom your horse to trailers and to other people. Know your emergency responders and the layout of your area. Get to know the other horse owners in your area. Make sure that important papers are in a safe and accessible place.