He's been off the track and barefoot for about a year now so we're over the soreness issues.
That doesn't mean your horse will stay that way - no two Trimmers and no two farriers look at a hoof exactly the same.
Unless they are completely void of ego, they all want to put their "mark" on a horse's hoof health. Sometimes that is very successful and sometimes it isn't.
I'm slightly acquainted with a Trimmer who believes in letting the horse "tough it out".
I fired my Trimmer of 3+ years because his work started getting shoddy.
He sored up my younger metabolic horse three times in a row and blamed it on diet. He sored up two horses of a friend and one ended up with an abscess; he blamed it on diet. He was the best for three years; the crux of the problem was him because he suddenly couldn't keep his personal problems from between the rasp and the hoof.
The person that now trims my horses hooves is me. I'm retired and would much rather save my waning energy to ride but the closest Trimmer to my farm that does consistent, high quality work is two hours away. He is my age and just had both shoulders operated on, so the trimming job has become mine, foreverafter.
My point is to find the best person you can, hope they stay that way and don't sore your horse. NO horse should be sore after a trim; if they are the person using the knippers has taken too much of something at one time and is not giving the hoof and/or frog a chance to acclimate.
Mainly because they want to see "results" in a hurry and most horse owners schedule trims for 6 - 8 weeks apart.
That is too much time in between but owners can't afford more frequent visits. I scheduled every five weeks and my Trimmer would get upset because, sometimes, there wasn't enough hoof for him to cut with the knippers; he had to rely strictly on the rasp
My next point is --- it might not be a bad idea to learn to trim yourself. That way the job's done correctly and it gets done when it needs done
If this sounds like a rant and that I am growing disgusted with a lot of trimmers and shoers, it's because it is and I am.
Apologies to the ones who truly their job but I'm beginning to think there's a lot more chest-pounding these days than quality work; especially after some of the hoof pics that get posted on all these forums
When asking around, don't just ask any horse owner. Ask folks that have not only owned horses for a few years but that actually get their nose in the horse's hooves take a genuine interest in how that little thing works that keeps 1,000 pounds of horse going down the trail.
If a person can't even tell you what the heel bulbs or the whiteline are, they might be clueless as to what constitutes a quality Trimmer.
I wish you the best in finding a quality trimmer