“From the errors of others, a wise man corrects his own.”
It's good to try your own mistake and try the experience of finding the correct and right things. This is the best way to find the truth. But there are millions of people who have made some mistakes in their own life and every single mistake is not like the other ones. So you need millions of years to find your own truth and correct your mistakes.
So what now, should we make every mistake?
No of course not, I believe that there are some things needs to be tried and there are some others that need to be informed by others. Like for example, there is some experience of an old man who knows much better than a young boy. So we all have to listen to the old to get their experience in life which cost them their whole life. And the one we should experience them ourselves are like driving, swimming. Like nobody make you swim or drive good but you. You can take many lessons but it will be useless unless you don't practice yourself.
So I believe that the best thing to do is take everybody's experiences and analyze them go with your beliefs and principles. And of course that will help you handling such a hard situation. Because no one has the time to do and try every single mistake in the whole life to prove to himself which is right and which is wrong. So we all have to learn from each other's errors and mistakes to correct ours.