Changed access permissions now machine won't boot. Utilising deep breathing techniques until help appears.

Maybe a brain snap but I changed the access permissions on the hardrive to everyone-no access, what do I need to do. After  20 minutes of beachballing I pmowered down, and now it won't boot up, gets stuck on the apple boot up screen. There also exists in permissions another access setting  admin-readwrite. Would appreciate some heads up on what I can do (trying not to panic). 

See this User Tip by Niel: I accidentally set a disk's permissions to No Access ...
https://discussions.apple.com/docs/DOC-2240

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