Miltec Exhaust Fitting

HI,

I just got my nice new shiny Miltec exhaust through the post today. And was pleasantly suprised when it came out the box with a single large oval pipe on the outside.

However because of my work, time is something of a luxery to me for the next couple of weeks. Can anyone offer any tips on removal of the old system, fitment of the shiny one and roughly how long it should take for the cat back system. I don't want the car off the road for too long.

Any help would be greatfully recieved.

Thanks in advance.