The footstrap is no good unless you have special flooring, we used to have to wear those at a job I did. You'd be better off getting an anti static wrist strap. What I did was verify that my electrical outlet was well grounded and plugged my power supply into a good power bar. I kept the power bar off but plugged in my power supply that was in the case. This way the case had ground. I left a side panel thumbscrew in and checked it with my meter to make sure it made good contact with the grounded case and hooked my wrist strap to the thumb screw.
Most people will tell you that you don't need a wrist strap and they are right most of the time. Stuff can happen however, and it is up to you to decide if you want to risk it.
When I worked with electronic assembly, we learned a couple of tips that I'll tell you. If you use a wrist strap make sure you dont have dry skin, wet your wrists, or apply something like aloe vera because dry skin under the contact point of your strap really reduces wrist strap effectivnesss. High humidity is bad for static also, so humid days are less "staticy"