You can search online for an instructor. Go to internet forums on horseback riding and seek help. Not only you will find many people willing to point you in the right direction but there are going to be some certified instructors who can be there and are willing to take a job when it presents itself. You can also search for one through various search engines.
Local Horse Racing Association
There are local associations for all sports in just about all areas. You can check with your local association and get the list of certified instructors. You may also get the list of schools that offer these services and have instructors with certifications. This will certainly be a big help in the process.
Schools that offer horseback riding classes have qualified instructors and you can join a school for the purpose of getting trained by a certified horseback riding instructor. This is one of the best ideas as they will be able to provide you not only with the instructor but also with all the required facilities and the horses.
Post an Ad
You can post an ad for an instructor in the local gazette or any other well distributed local newspaper. This will help you in reaching out to the instructors that are out there in the market and they will certainly get in touch with you. You can also get in touch with a local recruiting agency and they can arrange an instructor for you as well.