We mostly know our own abilities; although, sometimes circumstances can force us to try new things and find new abilities! Buy a 6 pk --get a "wrencher" buddy to walk you through it!
You might discover more ability than you thought you had!
Kevin is right about sometimes things seem a lot worse than they are too. A few screws loose can make things --ratlle --clunk -- run erratic-- and even stop and still be a very minor issue!