How can I install themes for Terminal? I am rather new to Mac, but I am trying to get familiar with Terminal and I want to change its theme. I am a bit confused on how to go about installing Solarized themes I am seeing so much of around the net. I am able to get the theme installed for vim, but I want it for just my general terminal usage.

I see some suggesting to install SIMBL but then I read if you have Lion, SIMBL is not needed with the color support that it has.

And then I've seen a suggestion to just "double click" to install, I am not entirely sure what is meant to be double clicked, the Solarized Dark ansi.terminal file?

My concern is running something that I am not sure what it is going to do. So anyone who could shed some light on this process, that would be extremely helpful!
Just open up terminal, go to the preferences and select the theme (the .terminal file)