How do I safely transact / sell btc over the counter at a bitcoin exchange shop?

[9thsky]

If I'm being extra careful storing my bitcoin by using an airgaped computer and electrum, and using only a master watch key, how do I safely sell bitcoins over the counter at a bitcoin exchange outlet?

The issue isn't whether the exchange place is reputable or not. Considering its a huge company (such as coinbase) and it's reputation is not in question, how do I make sure nothing happens between the transfers...like having to go online with my seeds and so forth?

Any safety pointers / protocol? I also don't trust my phone, it being rooted n'all.

[9thsky]

Thanks for replying guys! I was supposed to post this on the Technical forum so I made the post there. Could you please just copy and paste the above replies here --> https://bitcointalk.org/index.php?topic=5309359.msg56092980#msg56092980?

I'm locking this thread.

Much appreciated!