In reply to JSudd:
Hey,
Generally the hardest part is the first turn and a half where you're getting the screw to 'bite'. This part requires really sharp teeth (buy a small metal file if you don't have one rather than use the expensive specific tool as it works better. If they're really blunt there are professional sharpening services). Once you have sharp teeth the big handle helps you get this initial turn sorted. It's also easier to do at around waist height rather than above your head. You basically stab it in and rotate your wrist all the way around.
After the screw has bitten it will stay in the ice without you holding it. Putting the palm of your hand on handle and spinning it like you're cleaning a plate will screw it in quickly you don't need the little handle for this.
I personally really like the dmm screws and wish they still did them as I think they're the best screws I've ever used (I've used grivel, black diamond, petzl and some random titanium ones so think this is a fair statement.)
There's also a fair bit more to learn about making sure it's in good ice etc...
It's worth practicing on easy ground where if you drop a screw it's not going to cost a fortune and, if you can, get good instruction with an AMI instructor who is Winter Mountaineering and Climbing Instructor (WMCI) qualified. I would expect this to cost you between £200-300 a day but that could be split between you and another friend - i.e. only the cost of two dropped screws each...