first-hand experience

She knew things only an expert, or someone with firsthand experience, could know.

There was little in the company's operation with which she did not have firsthand experience.

What would it take to provide them with firsthand experience in this area?

That meant getting some firsthand experience in the kinds of problems he would be likely to face.

He however had other plans to gain firsthand experience of the business world and to play music after work.

I can tell you from firsthand experience that there is little or no learning in such conditions.

They were not writing out of firsthand experience at all.

But doctors with firsthand experience of the disease say the risk was real.

Something in his voice said that he spoke from firsthand experience.

I have discovered that to be true, from firsthand experience.