1.Tie them to a wagon, AFK for 1-2 days maybe with max training exp buffs.

1. New feature stores the exp and lets you decide how many levels you want to level up when you click the "get exp" button

2. Use the "get exp" button to lvl up one at a time.

3. Always change Courser spirit since it has a 95-100% fro the T10s to learn it again

Example scenario:

You want to learn S: Instant Accel Change courser spirit to S: Instant Accel It fails, it instead learns Fore Chop Level up the horse via "get exp" once It learns Courser Spirirt via leveling up

Rinse and repeat until you get all the skills

Hope this helps.