Using longer lines is nice because it allows you in the future to lift the tank up high enough to reach underneath and unscrew the hose clamps to detach the tank, instead of cutting the lines. Be careful however, not to use lines that are too long or they will get crimped when you put the tank in blocking fuel flow. You only want them long enough to give you access. Make sure that you drop off the old gas at your recycling center. Most places that take used oil will also take old gas.
Some people recommend removing the front trunk lid.
This would certainly give you more room, but it is not really necessary. Some people also recommend removing the steering rack cover underneath the car, but I don't think this one is necessary either, as all of the work I have described is done from above the car. Finally, make sure you do this in an area free from sparks or other source of ignition, as you will be working with an open tank of gasoline. To be safe, it is also not a bad idea to disconnect the battery. Select here to find out about ordering information, shipping options, and our money-back guarantee on all parts.