More questions about 2005 Altima repair?

So the dealer said if they replace my valve cover and gasket because I have a leak that when they get in there they will be able to see if I have any other leaks. Is this true? Also, how urgent is replacing front rocker arms and bushings? Is replacing a motor mount something I can do myself? I had more I... show more So the dealer said if they replace my valve cover and gasket because I have a leak that when they get in there they will be able to see if I have any other leaks.

Is this true?

Also, how urgent is replacing front rocker arms and bushings?

Is replacing a motor mount something I can do myself?

I had more I can't remember, but any insights on these good for now .Thanks : )
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