if you are not that confident with installing ICE or remembering where you pull stuff from, then if it makes you feel better about doing it yourself then buy one.
It will be cheaper than paying someone to do the install for you. Plus it will always come in handy if you want to do any engine work yourself etc, put lowering springs on that sort of thing.
Its not as hard or daunting as you would think though. Just have to be tough with it. If you are gentle you will break it. I know that sounds strange but i have always found it to be true.