There is ALOT of tubing you have more then enough to do it.  I personally went with cutting mine at length it appeared as in syscoolings picture.   If you have a winter ambient temperature it seems like it might allow it to get colder with extra space touching freezing air.

Best advice with attachment of tube get some hot water.  Dip the end of tube a few inches in water.  If you get the tube to warm up it expands and is much easier to put on the barb.  You can feel the difference it has a lot more flex for a few seconds out of the hot water. (I wish I could remember who said this, someone earlier in thread gets credit not me)