Why are we assuming the valve cover is cracked? This gasket is a really common failure on the N52. Dries out and starts to leak. Make sure you change the gasket on the VVT motor when you are there.
I also changed my spark plugs while there but not necessary.
Don't worry about Dust, dirt sure. you should clean the motor a little before you work on it anyways. Who likes to work on dirty engine parts?
The plastic valve covers are prone to PCV valve failures and a few have cracked. If you are doing the work yourself, you could consider have a new cover available and use it if you need, return other wise.
There are a few good write ups the describe the gasket change in detail. Pelican Parts
used to have on on their web site but there are a few others, Google.
You should not need a computer to reset the VVT adaptions and it's good advice to have a little sealant around to hold the gasket into the cover while trying to mount the cover. No need to change the bolts with the plastic covers.
good luck
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