190 E Valve cover

Okay - trying to replace the valve cover gasket on my '85 1905 16v. I don't have a repair manual yet - is this a difficult thing to do? Anything I should be aware of? Ps. Have the replacement gasket, what are the four smaller circular gaskets for. Sorry for the stupidity - just getting into this car recently aquired by my wife through a relative. Please be kind :-)

4 Small Gaskets Are For The Spark Plug Holes. Make Sure You Don't Damage The O Rings On The Plugs At Either End Of The Head Itself. Dealer Item Only.

are all 4 gaskets the same shape? if three are the same and one is different, chances are that they are the exhaust manifold gaskets.