This is tripping me up a lot. And I think this is one of the more difficult things to get comfortable with.

I open or raise with a good hand like AK.
On the flop I fire the first barrel with a continuation bet even if I missed.
If someone calls this, I often slow way down if I miss the turn too. I'll check behind and see the river, or put out a blocking bet, no bigger than my flop bet.

The continuation bet is trying to sell that I have an overpair. And if someone calls:
1) They're not buying it.
2) They have a little sumpthing-sumpthing (good draw, middle pair) and are gonna seeeee.
3) They flopped a monster and want me to keep betting.

In this scenario, the turn is where my bet is telling them that I have overcards and not an overpair. Basically, I'm offering them the pot if they have anything at all (small pair or better).

But on a some occassions, with the right read, I've held my ground, fired the second barrel on the turn, and took the pot down right there.

Can someone tell me when YOU are comfortable firing the second barrel?