Ask your Director/Trainer which horse you should assign to this purpose. This will be a horse you will perform the "Catch a Horse in a Herd" Challenge with.

When you successfully catch a horse from their herd and return them in a way your trainer/director approves of, create a training activity for that horse, and mark this challenge complete.

Ask your trainer/director which horse you can assign to this purpose for hands-on grooming. You can add as many as needed.

Ask your director/trainer which horse to assign to this purpose. Once you assign the horse (From the purpose page), mark this task complete.

Complete this challenge by cleaning a pen assigned to you, or by adding a horse to this purpose that you would feel comfortable cleaning their pen.

I haltered Savannah, led her through a gate and then led her to a stall. After she was inside her stall, I put fly spray on her and groomed her and then unhaltered her.