Just keep in mind that you are gonna hate it for about the first week. I know I did.
...but if you stick with it, you can navigate it faster than old Windows. Remember, left-clicking on the bottom left corner takes you to the start screen, right-clicking brings up this super handy thing...
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You never have to go to the Metro control panel unless you're changing the background and color of the start screen, or want to wipe Windows and start factory default. This confuses whole loads of people who think everything's been split between it and the old control panel. It really hasn't, though both do overlap in some places. Remember, desktop: old control panel. Metro stuff: new control panel (this is one of my main criticisms of Win8, by the way).
Lastly and most importantly, shutting down and restarting can be done quickly by bringing up the charms menu, hitting the settings gear icon, and hitting the little power button at the bottom of the screen. Yeah, this should be right up front on the start page. But it's not. Cuz someone at MS is dumb.
This should hopefully answer all the confusing crap you're bound to have questions about at first.
Windows key + X is easier imo to get that menu to come up, but thats a good tip. If you need an app you can just do windows key + Q and type it in/press enter and its loading before you know it.
Ive used windows 8 since launch, bought a Lumia 920 and am very impressed with Microsoft's new take on the OS. This is coming from someone who though the OS would be total **** a few weeks ago.