Deuce, I let my heroin addict ex lived with me and I was always stressed out when I had to leave my home with only him there. I also made sure to hide my digital camera, bring my laptop with me, ipod, check books... hide everything that could be pawned.
Also if he was in the bathroom for too long I would stress out too... especially when I find weird foil or brown stains around the sink.
DONT DO IT. Leave it to the professionals.