How much do you all tighten your plane cap screws, and spokeshave screws, and other assorted hand tighten tool parts?

My suspicion is that I overtighten.

Should I just go with less (just "snug") and then see when the blade starts to move back?

Sometimes, I have a hard time getting them loose. Especially the LV sharpening jig. Especially. Just paranoid the blade will move while sharpening-bad news, right?