Be very careful. If there was a spary gel incuded use it. If not use a solution os water, dish soap (several drops) and a capful of rubbing alcohol. Squeegee the death out of it. When you think you are done sqeegeeing - do it some more. Best bet is to install it when the temperature is over 60 degrees F. If you remove the transfer tape and there are some bubbles - do not stres about it - that is very common and will usually come out with time.
Lastly, this is actually one of the most difficult decals to install, if you doubt your ability to do it, try contacting a local sign company and see if the have someone that cna do it for you.
Good luck