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I have not personally made a tutorial on moving tokens to or from Bittrex, or how to trade there, but there are a lot in the search results here on steemit:
https://steemit.com/search?q=bittrex%20tutorial

You can send STEEM and SBD to Bittrex, and trade that for Bitcoin, and send Bitcoin to Coinbase. Bittrex is a legit USA based exchange and will require KYC, meaning they will have to verify your identity, just like Coinbase.


I see that @paulag is offereing to buy STEEM with payment via PayPal. You can read about that, here: https://steemit.com/hive-174578/@paulag/so-i-just-powered-up-and-if-you-have-steem-to-sell-i-will-buy-it