wow...thread revival FTW!
but in all seriousness, thanks for using the search function
about your question though- after finally installing one myself...is that the job is very easy.
If you bought the spoiler, it should come with the screws that you will need to install the spoiler. Beyond that, anything else is really a bonus.
In regards to your led brake strip, it should already have a resistor installed, so all you have to do is splice into your middle brake light and that's it.
In regards to mounting the spoiler, the easiest way is to make a template using a piece of bristol board or cardboard for the placement of the mounting holes- then drill, use some paint or other anitseizing component for the holes, and then mount your spoiler using the screws.
It's also a good idea to use some foam between the trunk lid and the spoiler in case you have a sub, otherwise the spoiler will rattle against your trunk.
good luck