When did you really know you knew what you were doing day trading?

It's been said it's not what you don't know that gets you into trouble, but what think you know for certain that does.

On that basis
When you first started day trading how many trades in did you think you knew what you were doing & how many trades in did actually know what you are doing?

I've day traded, momentum traded etc using charts on numerous occasions over the years & always started off well only for what I thought worked to fall apart 15-25 trades in.