I have just made it a habit to touch the side of the metal hdd bays whenever I open up my computer, it's to the point that if I have it open for a little while, I will literally touch the side of the psu or hdd bays everytime I put my hands inside the case, even if it's only 10 to 20 seconds after the last time I touched the psu or hdd bays...
Don't be too worried about static. I have never had a problem with it. I will touch metal just before I start to do something, but not every ten seconds. I lapped my CPU (with wet sandpaper), and never grounded myself once.