Wicked, I've been to competitions where the majority of the kids trained their own horses...from a trainer's eye, it wasn't pretty. Sure, they managed to get the horses around the barrels...usually...but there was a ton yanking and spurring and a runaway or two, most of the horses on the wrong lead or stumbling through a change halfway around the barrel, and the kids were all over the place in the saddle.
I am a believer that if one truly wishes to learn well, then they should learn correctly to begin with. That way, when and if they do decide to get serious in 1 or 2 or 10 years, they won't have 500 bad habits to break and 300 good ones to learn in order to be competative.
Personally, I don't see anything wrong with striving to be the next Pozzi.