See the thing is BTC is irreversible, once its gone, its gone, you can't do anything !
NEVER EVER GO to a place to trade BTC alone, you could loose your BTC, and may even suffer injury !
One of my friend got robbed on gunpoint cause people got mistaken that he owned 30 BTC, he only had 3 BTC, he was faking it on his social media, and when he was robbed and guys opened his wallet they was not believing that he only had 3 BTC. Scammers was thinking that he was hiding his BTC, and they beat him bad, but thank to his luck, someone noticed and interfered and he got his life saved ! Don't do anything stupid, SATOSHI went offline for a reason, world is greedy, people will kill you, one of dude got mugged in Thailand and got his credit card maxed out, think what could happen if they find you own crypto ?
Be Anonymous about your coins, keep them safe, and never ever meet someone unless you got backup !
Suggestions :
Do a meetup in a bank itself, take money and deposit right there !
Police Station is good choice too, but make sure you have proper way to bringing the cash home, they could follow you, and rob you in night !
Use brain wallets where possible, keep only small amounts in other wallets, so just in case you do get in bad situation your losses are minimised !
Avoid social media bragging, and keep your crypto circle to trusted !
Don't forget TAX, when you buy/sell the big amount, banks will definitely ask for some identification or proof !
If possible have identification of the seller/buyer !
Your life is more important then BTC, don't get greedy for extra 1%, Use trusted source !
Very nice and informative Post atleast someone thinks for others asset to this forum