How can I make my Facebook profile 100% private?

[Hello Kitteh (:]

Sorry but you cannot make your FB profile 100% private. You could have, but as of sometime around December last year FB changed the privacy settings to actually force its users to share at least some information. You can't hide from people anymore. Things that are considered public information are your name, profile picture and mutual friends. You have control over the rest of information.

Go to your profile and click the pencil icon next to your friends box and uncheck "show this list to everyone". You friends list is now private.

You can prevent people from searching for you but you will still come up in friend suggestions or people can click on your profile if they see you on a friends list or through your comments on friends' posts.

Go to "Account" at the top right of the screen and click "Privacy Settings". In Profile Information and Contact information change everything to "Only Friends".
When you go back to privacy settings click "Search" and allow only friends to see your search result and also uncheck the box to disallow people from finding you on search engines.