Handling almost right setups

There are times when you get near all right setups. It happens to me
many times, particularly when I am looking for a signal, some how,
now. That needs to be avoided. But there are times when an on the face
of it good looking signal later reveals it was not so good after all,
when it fails. It particularly happens at the shorter time frames.
In shorter time frames the noise levels seem to clutter one's clarity
of thought and the eye starts deceiving. So when such setups are
traded and they fail then what?

Best is to take the loss as it happens, if one is wrong one is wrong.
That loss will be smallest loss than if one had held on.

Other option of course is to stay away from short term trends!

If it was easy to avoid that temptation!!