Именно на своем опыте он должен пон

Именно на своем опыте он должен понять, как трудно самому себе зарабатывать на жизнь.

Результаты (английский) 1:

It was on his experience he should understand how hard it is to earn a living for himself.

Результаты (английский) 2:

It is his experience, he must understand how difficult it is to yourself to make a living.

Результаты (английский) 3:

in his experience, he must understand how hard it is to earn a living.