Before you do the display you check on the ground that you can get absolutely full aft cyclic without any restrictions such as the 5 point harness buckle getting in the way.
For the manoeuvre it is 1000' in the hover (some prefer a gentle climb) ideally into wind, ASE out (the gyros will topple anyway) but with the yaw channels in for stability, a deep breath and then full aft cyclic with some left as well to oppose the pitch roll couple that occurs on the Lynx. Hold it and look up for the horizon (just like looping a FW) and then you start to feed in forward cyclic to compensate for flapback. The extra drag on the TOW booms helps control the speed on exit.
It can be done from 1000' hover and recovered to a 700' hover for a second go but it's a lot of 'G' and rattling.
If you can manage to say 'Howaayyy ya foooka' in a Geordie accent as you initiate the manoeuvre then you get extra style marks
