That's not a problem mate I will attach a pic below, When I order my lights from ray I get him to attach the Pigtails as it saves me heaps of time and I'm not real good at soldering. The input is on the Left and I have just attached a strip at the other end and looped it back.
http://i862.photobucket.com/albums/ab188/ilovemyvrx/null_zpsf179ba50.jpg
http://i862.photobucket.com/albums/ab188/ilovemyvrx/null_zpsf179ba50.jpg