You're going to re-design your site's UI? Awesome.

What's wrong with it? Well, you already know that, it's obvious, right?

This is where UX methodologies step in. Pre-UX design would see the designer make assumptions around what could be improved, design it, and it was done.

Now, however, UX informs UI design, giving us the pain points, the downfalls and roadblocks to what your user is trying to accomplish.

If you're making assumptions in UI design you're doing it wrong. You're not your users, so go talk to them.