Take it to an archery Pro shop - they have the right tools to safely change out the string/cables - this is not a task that you want to experience an "oops" with...
FWIW - I had a Barnett Wildcat, my string/cables would not last more than 100-150 bolts before separating enough to need replacement - YMMV.
Last edited by AH64guy; 02/25/19.