Great question. I think each of those topics (staying on time to music) and (rolling through your feet ) are probably best tackled individually before trying to combine them.  In this video I talk about the critical timing of WCS (which should help staying on time)

Here's my take on posture. There are other videos too but this should get you started about how i think about it!

Megan and I talk through just that in this video!

Here are a bunch of things you can do to practice without a partner :-)

You're not the only one. I promise. I think most of us went through that at some point!

We have a long discussion about leading and following (although maybe not specifically anticipating) in this video.

That is the PERFECT way to go about it. Especially in class! I love to hear stories like that. All that being said... we've got several videos to help. Here's one to get you started.

There are a few videos on posture that might give you a few things to think about :-)

We cover a lot here!