Most horses can learn to do a passable job at the super low level (like intro). I hope this doesn't come off as me being a jerk but there's more to showing than riding around in a specific type of outfit. For the intro type classes, a lot is forgiven -- and if that's the level you want to say at then great! If you really want to show and be in the ribbons, you need a trainer to teach you and your horse the proper way of going for that discipline. Generally speaking, riding properly in a give discipline isn't something you can just decide to do and run wih on your own. You need eyes on the ground.
A trainer will also help you win the show prep and the show day itself, which at some shows can get very confusing.
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