There’s a certain willingness to self-educate that’s essential to specifying, so it may be that so many specifiers are self-taught because we can self-teach. I’m self-selected, partially self-taught, and mentored with kindness. Unfortunately, I’m not mentored with proximity: my mentor is 5000 miles away across the WAN. Still, my community, mostly my virtual community, is the key to why I keep specifying and keep learning.
I wish I knew the answer to Susan’s question about avoiding the “error” in “trial-and-error”. Probably the nugget I would volunteer is “Don’t issue a spec you don’t understand.” If you are using a master you didn’t write and you don’t understand what it says, either go find out or go ask someone. If I wasn’t humble before I became a specifier, I was humbled the day one of my colleagues pointed out that I’d been routinely retaining a product in our master that’s nearly never used, simply because I thought it was something else and hadn’t bothered to find out what it actually was. This principle goes deep: don’t reference an ASTM you’ve never seen, don’t guess what a value ought to be, don’t write a spec for a product you’ve never heard of until you’ve researched it.
Of course there’s a flip side: you can research something to the last detail and blow the budget. I suppose the antitdote to this is to pace yourself: spend the most time on the least-familiar subjects and the highest-risk subjects. This is the part of time management that I need to remind myself… Thanks for asking, Susan!