There's such a thing as an "educated guess" and such a thing called "guess". The educated guess is from someone who's educated in a certain field and holds some credence. The guess is from the layman and is just that - a guess.
My experience with an educated guess put my son in the hospital. Prior to the educated guess, it was just his guess as to the proper medications to use for his medical condition after he did his homework and researched the medications he used.
Oh, I hold no malice towards the nurse with the educated guess but, would she care to possibly lose a leg or to share in the medical expenses involved to bring my son's condition back to the condition she found him prior to her educated guess?