Can you install catalytic converter without a mechanic?

Can you install catalytic converter without a mechanic?
ANSWER: You can, but you need to know exactly how to do the replacement correctly. The importance of a completely leak free seal on the "cat" is crucial. Poor engine performance, a $25,000 fine, and/or carbon monoxide poisoning all await you if this is done incorrectly.
In short, if this is not done exactly, you will cause more problems than you will cure.