How to disallow everyone except me with .htaccess

Hey, everyone!

I'd like to disallow everyone except me from my testsites main directory, but allow them access to /blog directory.

Ok I'll try to describe what i am looking for-
someone visits my site- since user's IP is not in my htaccess, they are redirected to /blog/
when I visit the main directory htaccess has my IP and I can see it's content
How can this be done?

Thanks in advance!

Chris

 

In maindir .htaccess

In /blog .htaccess

 

Thanks, zacharooni!
Everything works fine except the redirection part. Can someone please check- badguymarketing.com and see if you are redirected?

Thanks!

 

ErrorDocument 403 /redirect.php

in redirect.php

<?PHP
header("Location: /blog", 301);
die();
?>

 

thanks, worked like charm!