Who's can I confirm, at least in part ?
Or do several sources agree ?
Sometimes you can't confirm or verify or double check with another source.
There have been/are an individual or two whom, from past experience and personal knowledge of them, who's word I trust as true.
I guess, for them, I would be weighing their advice at 100%....so perhaps, with them, I am taking advice rather than evaluating it at that moment.....the evaluation has taken place over a number of years and it all has been verified and tested true.