I'd start with just the bedroom, then work from there.
If you're concerned about the stereo system then I would keep that sectioned off at all times. It's not their fault if they get into things that we allow them to, they're not human
Jasmine - Female Miniature Poodle - born Aug 15, 2010
Loker Delgado Von Stalworth - Male GSD - born Jan 26, 2012
Koda & Zazu - 6 year old male cats
Alex - Male Cocker Spaniel (rescue) - RIP Cuddlebug 2007-2010