So Annoyed…Permissions Help!

I’m a WP newbie, I am reading the tutorials but I did attempt to set up my site already. I’ve already managed to screw up the permissions, I mistakenly thought that users could edit my blog, so I changed the permission in the CPanel File Manager. Then, I realized it was a mistake and changed it to 644. Now, if I go to my site and try to login, I get a 403 forbidden message. Very frustrating, I’ve spent about two hours combing through forums, faq’s to no avail. Is there an easy way to fix this, or no?