Struggling to complete this one any tips

u need to buy from merchant inside INN 

1)Raw Sugar and mineral water, heating them until u have 6-7 lamp of sugar (or something like that)

2)buy rope from stable master

3)go to wild horse equip rope press RB then when horse is crazy push A then B (to much time) when horse calm down run toward him and when u are in front of it PUSH Y (use item) and give 5-6 lamp of sugar...congratulation ^^

Yes skip the wooden horse training, just find a wild horse n practice on that.