Hey no biggie. We've all gotta start somewhere. Good on you for trying to figure it. Besides the photo above, check out a standard drill chart. a 1/2-14 NPT tap uses a 23/32" drill bit (nearly 3/4") whereas a 3/8-18 NPT uses a 37/64" (about 9/16"). I reference the one on my wall all the time.
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