Are you a big fella? 69 and 71 inch skis are very long. If you are 185lbs or less you may wanna go way down to a 67 inch ski. You would probably be able to run a 68 inch ski up into 220 lbs. You cannot go wrong with Radar. They are great skis.
Learning to ride the dumb things is what gets tough. Body position is critical, especially as you get deeper into the course. Bendnig the knees, getting the hips forward, keeping the handle at or below hip level at all times, quickly transitioning, paitiently waiting to hook up, you have nothing but fun times in your future.