it is difficult
Examples
It is easy to hate and it is difficult to love. This is how the whole scheme of things works. All good things are difficult to achieve; and bad things are very easy to get.
It is difficult to get a man to understand something when his salary depends upon his not understanding it.
It is difficult for a woman to define her feelings in language which is chiefly made by men to express theirs.
It is easy to be born, it is difficult to be a human being.
It is difficult to steal when the boss is a thief.
When a twig grows hard it is difficult to twist it. Every beginning is weak.