What I did was to remove the clamp at the bottom end of the tubing - where it connects to the intake manifold, and at the top end - where the larger tube connects to the camshaft cover. Then you wiggle and snake it out -upward-. The hardest part is getting pliers onto the 'squeeze clamp' that is down by the intake manifold, due to the fans being in the way. It is possible though; I used a long pair of needle-nosed pliers.
Welcome to working on Neons!