You already know this but, I don't know grammar. I have never learned it and never will, yet, I'm still a bit of a grammar nazi. If something looks and sounds right, it's probably grammatically correct, or at least good enough for me, and I notice errors in written English pretty easily. I just don't usually know the grammar rules. I do google a lot of phrases or words that I can't figure out by myself by trying what looks the best.

What kind of language and how particular I am about grammar depends a lot on the day and what I am writing about, and to whom.

Edit: itse opin tänään uuden sanan kun tilasin sängyn. Aloin pohtia että mitähän jenkkisänky on englanniksi, koska olin aika varma että se tuskin on yankee bed. Hetken googlailtuani sain selville että kulkee uudessa maailmassa nimellä continental bed.