My gf has a 2007 X5 3.0 and I noticed the valve cover gasket leaking.

Figure i'll go ahead and change sparkplugs while I'm there.
How big of a PITA is this to replace?
Any suggestions or tips?

Has been suggested that I stick with OEM gasket...what about the sparkplugs? Was gonna with Denso Iridium..

Pretty handy when it comes to mechanical stuff..

Thanx in advance!