I don’t recommend selling some. I recommend selling half. Which shares doesn’t ultimately matter. That’s a tax question, reaally.
In the end, you’re still cutting your risks in half and you’re still ensuring the capturing of some profits.
So if you owned 100 shares, you’d just put in an order to sell 50, for instance.
Eventually, you’d be 100% out of all shares anyway. Some will be bigger gains and some shares will be lower gains. Yet the overall gain, huge.