What you do with the club in the first two feet of your backswing makes all the difference between your best shot and your worst.
That is the interval where your clubface can get out of alignment without your noticing it. Open or closed, this is where it happens, and you can’t do a thing about it because you won’t feel it.
Practice this a lot: Take the club away using your normal swing and stop after the clubhead is about two feet away from the ball. Using your arms only, bring the clubhead back to the ball.
If it’s not square, you have something to work on, and it’s simple. Practice taking the club back those two feet so the clubface stays square. Learn what it feels like to do that.
When you play, do this takeaway drill before very shot. Remind yourself of the feeling, because the difference between right and wrong is hard to detect.
With that, and a soft grip pressure, you’re good to go.