It's the first time I've done anything
mobile-ish, and I don't have such a device myself, so any feedback
at all would be most welcome :)
You do not have _any_ mobile device?! :)
Are you aware of the free or cheap (or at least with free trial) services like saucelabs.com or browserstack.com? You can use them to see how a page looks like with different OS/browser combinations.