Hello:

What I have to do to manage my own horse?

Thank you.

That is a bit of a vague question and the title is irrelevant.

To say the least

Remember English is probably not everybody's native language on here. This person may be asking how to control their horses during a race...

When you go to tell the jockey the tactics for your horse select 'take the reins' and you'll be able to control the horse in the race.

Now that you have pointed it out it's obvious that this is what the person was asking

how do you control them, is there a video tutorial and is it any better?

No video I don't think. But there are instructions which you can read...

In SO3 I ALWAYS rode my own because I found the jockey's unreliable. In SO4 for some reason whenever I clicked 'take the reins' in my game it would freeze. So far in SO5 I haven't tried it a lot but I found that I couldn't get my horses to break at the same time as the others (I think this was due to the button not working, fixed in a patch) and I find it is very easy to clip heels and you tend to get pulled up for careless riding more often. Even though on a 2D screen it is very hard to work out the spacing between the horses.

Why not give it a go and see what happens?