Charge the marker before you teach anything
The marker — a clicker, a tongue click, a single short word — is a promise: that sound means a reward is coming. Before it can teach anything, the pony has to believe the promise, so spend the first session simply making the sound and immediately delivering a small treat, a dozen or so times, until his ears prick at the sound itself. Use tiny, low-value treats so a whole session adds up to very little, or a good scratch if your pony gets shark-like around food. Work somewhere quiet and familiar, keep the lead rope loose, and expect this stage to look like nothing is happening — it is the foundation everything else stands on.
First target touches
Your target can be a purpose-made stick with a ball on the end, a cone balanced on a pole, or the lid of a tub held in your hand. Present it at nose height, a short distance in front of him, and let curiosity do the work: most ponies investigate a new object with their nose within seconds. Mark the instant he touches it — not the approach, not the sniff near it, the touch — and reward. Then move the target a little: left, right, lower, a step away so he has to walk to it. Within a few short sessions most ponies are following a target eagerly, and you now own a way to move and position him without pushing, pulling or wrestling.
Turn touches into a station
Next, give the pony a place as well as a target: a rubber mat, a square of carpet, a marked patch of ground. Use the target to lead him onto it, then mark and reward standing on it, and slowly stretch the time between arriving on the mat and the reward arriving. A station matters for vet and farrier visits because it gives the pony a job he understands — stand here, on this, and good things happen — instead of a vague instruction to 'stand still' while strange things are done to his legs. Practise the station in different places once it is solid at home base, including where the farrier usually works.
Shape the actual visit skills
Now build the real repertoire, one small piece at a time. Stand quietly while a hand runs down each leg. Lift each foot, hold it a moment longer each session, let a hoof pick tap against the hoof wall. Rest a rasp against the hoof, then draw it once, so the sound and vibration are old news. A hand resting on the neck, a stethoscope-like touch against the ribs, a second person standing close while the first handles him — each is a separate tiny lesson, marked and rewarded, never stacked into a whole mock examination in one day. The pony who has been paid for every piece separately tends to stand through the real visit wondering when the treats arrive, which is exactly the frame of mind you want.
Keep sessions short and end on a win
Two to five minutes is a full session for this work, and the discipline of stopping while it is going well matters more than squeezing out one more repetition. Little and often in the weeks before a real appointment beats a long rehearsal the night before, and it is worth telling your vet and farrier the cues so they can let the pony touch the target and stand on his station during the actual visit — most professionals are delighted to work with a pony who has a system. With the plan sitting in KinsLe's Care Teams, each handler can pick up the target work exactly where the last session ended, marker sound and all.