Help calm my nerves

So Im finally ready to install the tail stripe on my Scamp. Im nervous as heck to tell you the truth. I've been told to use lots of soapy water, similar to installing window tint. As long as its wet it will slide, until you squeegee it out.. Although I have no starting point or measurements and I have yet to find any. Is this as hard as Im anticipating? I just dont want to mess it up.