[Mike O]

Ok this is a chronic problem for me.

How do I learn to get my shoulder down plane and start swivelling properly? Drills? Swingthoughts? What can I do to learn this?

I have only a vague notion what it should look like.

So your right shoulder is moving off plane too soon? "roundhousing"?

Is the swiveling you're talking about - a release swivel or a finish swivel?

When you say you have a vague notion of what it should look like- Could you describe what you are doing now that you know is not correct?

It's best to have a link to a video of your swing.