I just spent some time installing new fonts, too. I found that (after the file was unstuffed), I just had to double-click the font to bring up a preview of it; and within that preview was an offer to install it. Just click the button and done!
Yeah, I love how it's so much easier than the old OS9 days of having to put the fonts there yourself. 🙂 More info for those looking at fonts, I've found that when given the option to download the Windows or the Macintosh font, downloading the Mac gives you a .sit file a lot of times. Instead, I download the Windows version (almost always a .zip file) and that works fine.
Given the option between TTF and OTF, always go with the OTF one 🙂