Things to never do in this hobby.

If I had a dollar for every time I did that I could buy a 1916-D Mercury Dime

 

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Never rinse a coin over the kitchen disposal.

Never tick off an auction company that is selling your coins.

Never put a slab in your pocket along with a 2X2 with staples.

Never offer to help someone sort a collection without knowing how large it is.

Never buy a coin you do not understand. Walk away, learn and go back with a better understanding.

 

Been there, done that. Not to mention, you seldom get any gratitude, more often complaints because you told them the truth.