1. I don't click on AdSense ads, anywhere. (Got into that habit right from the beginning in 2004).
2. I use my own non-AdSense graphics in matching ad sizes as placeholders when making changes to my websites. Once I'm satisfied that the layout looks ok, then I go live with the AdSense code.
3. I rarely visit my sites, but instead have ad-free clone versions of them in seperate directories to monitor that they're working ok.