I know I already gave you my opinion on this, but I'm going to elaborate some more and get pretty deep on my experience with training Henny.
I got him when he was 5 months old, after owning horses for 8 years, but not have a very extensive knowledge on horse care. When he was 6 months old, I took him to a halter show where he was so tremendously well behaved. My farrier at the time told me my 6 month old behaves better than most 6 year olds. I broke him to trimming myself. Everything he knows, I taught him(some things with help from a great trainer) besides halater breaking and tying. At 6 months he'd load right up into a trailer no problem, let me touch him anywhere, let me cover him with a tarp and not even flinch.
At 7 months, the night before Thanksgiving, he was kicked in the head by an older filly. It was midnight before my vet was available for me to haul him in. My baby boy had the world's biggest headache, eyes twitching uncontrollably so he couldn't see straight, couldn't walk straight and dragged his back legs. His head tilted so severely to the left you could see his entire head and neck when looking at him from behind. This little boy, who was so much in a world of pain, loaded up for me on that trailer in the middle of the night without being able to see or know what was going on. I was so terrified he was going to fall on the trailer ride over that my friend(bless her heart, her and her mom kept me from going absolutely insane) and I rode in the bed of the truck to keep an eye on him. Any time I couldn't see him I would freak and ask my friend if she could see him. Every time she'd say yes and laugh. I was a mess. He unloaded perfectly(backed up, again with absolutely no coordination) and was an absolute gentleman for the vet. He was stuck with so many needles, exposed to clippers for the first time, and even had a catheter inserted in his neck and he never once flinched or put up a fight. I left him there as comfortable as he could in his situation happily munching away on hay at 4 in the morning, not knowing if I was going to see him alive again.
He's two and a half now, and is still a little gentleman. As the youngest horse at the barn, he is the most well behaved. I don't know if he'll be able to ridden, due to his neurological issues, but he has been saddled a couple times and never once thought of it as scary. He is a lot more insecure now, with his left eye permanently looking down just a smidge so his vision isn't 100%, but it's taught me even more about how I need to compensate for his handicaps and be the confident leader that he needs.
My point is, if he did not have the great training, which happened with hours of blood sweat and tears(LOTS of tears for his accident), he would not have loaded up on that trailer. He would have DIED, without a doubt. The training I put into him from day one, from 5 months old, saved his life. That is why, to me, training is so crucial for horses, especially the babies. So no, I did not have oodles and boodles of horse experience when I got Henny, but I had the know-how, common sense, and the "feel" for horses that was necessary to put a great foundation on him. It is possible, but it is also very difficult and so much hard work you wouldn't believe. Don't get discouraged! Take these few years to learn as much as you can. Hands-on experience in everything horse-related. It really helps, and it's really important.
There on the tips of fair fresh flowers feedeth he; How joyous his neigh,
there in the midst of sacred pollen hidden, all hidden he; how joyous his neigh