ESD is a tricky thing! Different locations, the season and the weather can be the difference between a good repair and one messed up by ESD (static electricity)!
Your work area is also a factor. Make sure you use static free flooring & the chair you are sitting in.
I would recommend getting an anti-static mat which is hooked up to a good ground point. That way you're covered. Whats important is placing your tools and parts on the mat so they discharge any static charge, this also includes you as well!
The big question is how sensitive is the gear you are working on. In years past it was very sensitive MOS & CMOS could easily get damaged. Newer DTL & TTL logic was less sensitive. With the start of microprocessors better techniques to protect the logic was introduced making them less sensitive every generation.
From my understanding the pendulum will be slipping the other direction as we go deeper into the sub-micron scaling of chips.
Here's a bit more: ESD Wrist Strap, What to Connect To?
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