How can I edit an icon in OS X?

This is a real rip-off of an answer, since it’s copy&pasted from the Help menu:
“To use a custom icon:

Copy the picture you want to use to the clipboard.

One way to do this is to open the picture in Preview, and then choose Edit > Copy.

Select the file or folder whose icon you want to replace and choose File > Get Info.

At the top of the Info window, click the picture of the icon to select it, and then choose Edit > Paste.”

^ That’s how to change an icon.

To edit, use Iconfactory’s Iconbuilder Photoshop plug-in.

or just make a copy of the existing icon, open it in preview, rotate, save and copy and paste over the existing icon.

Wow, that actually works! Save it as a PNG to preserve the transparency.

Perfect, no extra software required.

Thanks.

i use candybar though, i’m lazy