I am attempting to do an oil change on my wife's E320 for the first time. I have witnessed this being done in the shop, to my recollection, am I correct in saying that the oil filter is accessable from under the hood. I have purchaced a new filter and realize that this is a canister style.

Is there a special tool required to open this canister ??

Can you give me some reassurance that I have located the filter canister correctly ??