reexist

I just bought a 1995 Lexus Sc300 and it won't pass smog. A buddy of mine helped me take a look at it (and i admit I don't know diddly squat about cars besides the simple oil and coolant changing.) Anyways, We checked out the car and it turns out the exhaust manifold has a hole in it and won't pass smog and he also said that I also might have to clean the EGR System. I already bought an OEM exhaust manifold for the sc300 but I just need advice on how to install it because I want this to be a learning experience. Also, I want to learn how to clean out the EGR system.