2000 explorer oil leak

I have a 2000 Explorer, 4.0 push rod with 55000 miles and now have a small engine oil leak. Die indicates it's coming from the engine front cover (timing belt cover). It is a minute leak that's
undetectable in the dipstick. Has anyone out there in Explorer land done this type of job (replaced the gasket)? Is it difficult?
Hank from PA

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