How do I change the A/C condenser on my 99 bmw 328i

How do I change the A/C condenser on my 99 bmw 328i i had my 99 328i checked out at the shop and they quoted that i needed a new condenser coolant and oil. they gave me a price at about 1200 condenser being 650 and then labor. my question is ive ordered my own condenser for about 75$ so i just need help with the installation now. any help in doing this is appreciated maybe a step by step guide or something,