Depending on the condition of the horse, all ages of horses should be trained.
yes
If they're inexperienced i would say no. if a horse is trained wrong when its young the damage could be hard to undo or permanent.
About even with its throat latch, is how I do it. and the side should not matter, as every horse should be trained to lead from either side. The horse should also be trained to keep his head right in front of your shoulder, keeping you even with his throat latch. He should adjust to your speed and position, not you to his speed and prefered position.
Horse trainers
"His horse was trained to race." is a simple sentence.
A horse with a rider on should not have an issue with any neignboring horse if trained correctly. This would be a bigger problem if paddocks are shared, but while riding the horse is to be compliant with the rider.Regular riding of your horse with you in strict control should build this bond.
It depends... On the girl's riding level Disposition of the horse Is the horse trained? If the Girl's a beginner and the horse is calm and trained then that would be good but if the horse is untrained i would not recommend it. If the Girl is a fairly advanced rider I would say the horse would be fine for her. Just remember the horse is young and probably spooky will be a brat sometimes. So keep your patience and hang on tight.
you should barrow your horse
NO horse is completely trained!
It depends on the horse. Your horse should know when to take off, so if your horse is already trained, don't worry about it, and even if you are trying to train a horse, just see how he/she jumps on their own first.
by a horse
From my experience, barrel racing horses are often crazy, poorly trained horses that know only one thing: Run. They are often ridden with harsh bits because that's the only thing that can control them because again, they only know to run and that is all they've been trained to do. Not saying that all barrel racing horses are like that, but all that I've seen are. Not at all what you want for a first horse. You want an easy-going well-trained horse. I would advise a horse trained in reining. Horses trained for reining are super broke, calm, responsive well-trained horses. Not saying reining is the only way to get a horse like that, but any good reining horse is.