For the install, you'll want to get the car up on ramps or jackstands for both front corners. You'll need to get back under the firewall, to get to the rearmost part of the tube.
Pretty sure it was a t45 that holds the fittings at both ends. Put a little oil on the orings before you push them in. It will be easier to get them in and it will give you a good seal.
Check the depth of the new fittings too. Mine was non-VW aftermarket and they were a little less deep than the stock ones. I had to put a couple extra washers on the bolts, before putting them on, to allow them to screw in all the way tight. I guess the metal that they screw in to is not that deep. If your fittings look exactly like the stock ones, you'll be good to go.
Make sure the fittings snap all the way in before tightening the bolts. If you are a little off, the little guide rods on the fittings will not go in their holes. Luckily, you're working with aluminum, so it has a good deal of give for twisting and bending it into place. Another issue I had here was that the little guide rods were a little thicker than the stock ones. Stock were actually hollow steel inserts and the aftermarket were solid aluminum rods. Mine didn't want to go in the hole. I took the dremel to them, just a little, and they went right in. If you have to do this, make absolutely sure that you don't get any metal shavings in the line.
Get a good idea of where the old tube was in relation to the low pressure line. It kinda twists around on the way to the back of the car, so you'll want to feed it the right way when you put the new one in. Maybe snap a pic or two before disassembly. You will want to unscrew all the clips holding the low pressure line when you get ready to install. This will make moving the new line into place a little easier.
For the rearmost fitting, you'll want to put a rag or towel on the rear pcv fitting, to protect your left forearm from getting all scratched up.
Make sure the hold down right behind your passenger headlight area is secure, before driving the car. If it's loose there, the line can get tweaked when the motor torques forward and back. It could get pulled back into the serpentine belt and re-punctured.
Ummm. I think that's about all as far as headaches I had with mine. The part number was 1K0820741BC, AKA 1K0820741AF,and I believe a few others. The BC number os the most recent revision and the most readily available IMO.
Good luck with the install. Take your time and you'll be fine.