just got 4.6 cat-back exhaust...

[EX-5IVE]

hey just got the 4.6 exhaust system cat-back, and i want to install it myself, you know get under the car and see whats under there for once, i am going to be doing it with two of my friennds who are very very knowledgable with these things...i am wondering if we can do it ourselves, or should i just take it to my mechanic, hes a good friend of mine...also i think i need the 4.6 hangers or something, if so, can someone give me the part number and where i can purchase them asap...thanks in advance guys...also i have the double black tips, and was wondering if i wanted to change it to the oval tips, is it posiible....thanks again