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overheating on 1999 Cadillac Catera

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
99 cadillac catera overheated and water that come out of resevoir left an oily residue. Blown head gasket?
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(1) Comments
very likely. get it leak down test to confirm.

Roy
Is this something I can do or do I have to take it to a mechanic to get it tested.
Bad coolant/oil heat exchanger. Common problem.