翻译：没亲自试过 请不要轻易下结论

without investigation there is no right to speak.没有调查就没有发言权
without attempt there is no right to make a conclusion.
感觉这样翻译挺好的

应该是这样翻译吧。。。

"如果你没亲自试过,请不要轻易下结论!"

"If you do not personally tried, please do not lightly to conclusions!"

Had not tried not drawing a conclusion casually, please in person

Don't make any conclusion if you haven't tested it yourself.

Don't draw a conclusion casually until you had tried it.

No investigation,no comment.