[Elecraft] ESD precautions?

[Able2fly at aol.com]

I've built a couple of solid state kits paying little or no particular 
concern to ESD damage other than using a 3 wire soldering unit. No problems so far, 
but I may be pushing my luck. What would be the minimum preventive measures to 
be taken when building something like the K2?  Is a grounded mat desirable? 
If so, would AC mains ground be the place to ground the mat to? If there is a 
tutorial along these lines, I've yet to come across it...

Thanks,
Bill  K3UJ