besides the bolts on the cat, it will be a breeze...

Some tips...

1) Use penetrating oil liberally and let it sit for as long as you're willing to wait... it will make it a lot more painless.

2) Use some bungie chords to help support the cat... Generally better to place the least amount of stress possible on that gasket, esp if it's old...

3) Check the welds before you put it on your car.

4) Tourqe dem bolts down tight

5) Take your time