Yep... all those things are problems for the average person with no special tools or abilities. I would have been happy to tell you that, but i kinda thought it was mentioned here a few times.

Yes you are correct, the inlet is not in the correct spot... and needs some fancy welding or additional pipe made to accommodate. You were wrong tho, the stock system is Stainless steel, and will require that someone that knows how to work with it is on the job. Most muffler shops will not even deal with stainless... its harder to weld, and even harder to bend.

The stock tips to fit pretty well, but again they require that they be cut and welded in place. The hangar will also have to be welded on and in the right place...

I did this myself, but then again i do have the tools to do it, a mig welder with stainless wire, Argon welding gas, torch, odds and ends of stainless material, and grinders. It took me around 3 hours, and i was not that happy with the loud drone sound that it made when i was done. Take it to a fab shop and see how much they want to do it... some i've seen wanted as little as 100 bucks to make it work. Its certainly worth the 100 bucks.