I'm canning for the very first time!

3 pints of leftover turkey noodle soup if all goes according to plan.
(I'm eyeing our little potato harvest too, we'll see what happens after this first attempt is done.)
Can I ask a dumb question real quick? Why do you need to boil the jars and simmer the lids before you pressure can things? I keep reading how important it is for sterilization purposes, but I wonder why you need to bother when the whole point of canning is to basically sterilize the food... you'd think the jar/lid would be sterilized at the same time. Does anybody skip that step, or am I just trying to be lazy?