I've not personally done the swap, but the motor will go right in, no problem. I'd use better engine mounts when putting it in. The transmission will bolt right up. You can use pretty much any transverse 1.8t (AWP, APH, etc). You'll need a downpipe (aftermarket would be better, but stock would do). You'll probably need the radiator and it's hoses and such from a 1.8t as it has different feed patterns compared to the 2.0. And then you'll also need to swap the harness and ecu. This is the tough part from what I've read.
I would also consider putting a better clutch on there as well, the 2.0 clutch won't last long with the bigger power.
I may be missing a few things (quite sure of it actually), but this should be pretty accurate