Spark Plug Location - 97 Camry XLE

Help, can't locate 3 of the 6 spark plugs for my wife's 97 XLE camry. 3 are right in front as you're standing in front of the car. Where are the other 3? To replace, do you need to remove the black/dark grey "cover" that sits on top of the engine? I refuse to pay the dealer $100 to do the job. I've always done this type of work on my cars. Feel kind of dumb that I can't find them. Thanks
Bill

Same place as the front three, only on the back side of the engine (viewed from the front). Yes, you will have to remove any covers that exist above the valve cover.

Same place as the front three, only on the back side of the engine (viewed from the front). Yes, you will have to remove any covers that exist above the valve cover.

Thanks for your time and effort to reply. There is something inaddition to the two hex screws holding down the cover. If I can get that off, things should be easy. If you have any ideas, please reply. Thanks.
Bill

Probably an additional two clips.