Hide Menu

You can do this with page specific css. So hiding your menu on the blog page would look like this:

.blog #nav-main {
    display: none;
}

Then to show a footer menu in only one page you would hide with menu with css like this:

.footernav {
    display: none;
}

Then use an important tag to make it show on a specific page like this:

.blog .footernav {
    display: block !important;
}

All css you can paste into your custom css box in Theme Options > Advanced Settings.
This tutorial explains finding page id’s- https://www.youtube.com/watch?v=fLg2T1AvmFE

Hope that’s helpful!

Hannah