Catalytic Converter on 2003 Mitsubishi Montero Sport

can a non mechanic remove a catalytic converter. And how do you do it?

Yes, now on your vehicle there may be more than 1 catalytic converter. 1 for each bank of cylinders. So you would have to remove the correct converter.
thank you, i was told by a mechanic is it bank 1, for me to purchase the front passenger side, does that sound correct?