Cutting out shells

[Belsten]

Does anyone have any suggestions/recommendations on what to use or hints/tips/techniques ?
I used to use a cool pair of nail scissors which I no longer have Recently I have tried a variety of different sized kitchen scissors and a sharp scalpel. For those that dont know me, I am a little heavy handed especially with a sharp scalpel
At the mo im trying to cut out a repro kanzen shell which is a lot thicker lexan than normal shells and im struggling
What are the branded lexan scissors like (associated, tamiya etc) ?
Thanks