I have always trimmed my own horses. I learned from watching my dad, on our ranch, who learned from watching his dad. Dad would always point out a horse that was standing awkwardly or one whose hooves were grown long, etc...I watched and learned and was doing it myself when I was a teenager. Our horses always had good feet, no problems.
I would suggest getting a farrier that doesn't annoy you, and even trailering your horse to him if you have to. But get him to agree to teach you and watch as you do it and point out what you should or shouldn't do. It won't take very many trims for you to learn to get it right, and you can do it on your own. This is dependent on if your horse has good hooves and the cracks aren't a problem....your farrier should know and tell you if you'll be alright trimming him yourself.
Just a few tips that I always remember about trimming:
1. You can always take a little more off, but you can't ever put any back on....don't get over-eager with the nippers. Use the rasp more if you just need to take of a smidgen.
2. When holding the hoof, looking down at it, I usually begin at about the seven o'clock position, and start nipping just gradually, from the edge of the hoof, deeper. Then nip your way up around to twelve o'clock and on around to about four o'clock where you will taper off to the edge again. You need to take off about twice as much at the toe as you do at the heel. Horse's hooves wear naturally at the heel, and sometimes all you do to the heel part (between 4 o'clock and 7 o'clock) is take a little nip off of each corner. It depends on how they grow each time.
3. Try to keep your nippers level, and clip again exactly beside where you clipped last. If your nippers aren't level and even with the last clip, the hoof will be all jaggedy and rough and uneven. You will have to rasp a lot to even it up.
4. A good rasp is worth a lot....you can really make a hoof nice and smooth with a lot of rasping. I usually work in a semi-circle motion, to smooth the edges of the hoof as well as the underside of the hoof.
6. I bought my rasp and nippers at Tractor Supply Company, I believe. For about $80...and I've made much more than that back in what I've saved from hiring a farrier!
Good luck. I'm sure you can do it. It is really hard work, but just take it one hoof at a time. If you just do the fronts, you can come back and do the hind hooves the next day, no problem.