hahah.
when you take off your valve cover and front timing cover, there are only two you can get to.
the lower timing cover (the whole front bottom half of your engine) houses a third timing guide, but you need that one. you'd need to take off all your belts and your crank pulley just to get to it... so yeah. you won't take it off accidentally.
no timing chains usually do not need to be replaced. that's the whole point of a timing chain!
