Where English uses a verb form, Chinese would more likely use vocabulary or sentence form to convey the same sense.
It could be a sentence particle:
离开这家公司很难啊！
Or it could be a verb of perception, like Rita said:
我觉得离开这家公司很难。
Or you could front the leaving:
离开这家公司，肯定很难离开。
Or you could front the assessment:
很难吧，离开我们这家公。
Where I live, in the south, we love to use questions:
离开这家公司不是很难的事情吗？