Like above, I know what adb logcat is but I've never used it and am not sure I'd trust myself to use it without breaking my phone ... but with a little handholding at the beginning would be willing to try.

(And I attempted to find my size/density basically everywhere -- manual, phone site, Google at large -- and failed.)

I am also aware that it's extremely unlikely that using the debug bridge would break my phone, but I've done some amazingly bad things to technology by trying to work with code just due to sheer bad luck ... my dad does some dev stuff, though, I'll see if he has thoughts on it.