Several people have written that NZ plugs are fiddly to wire, but there are different brands. Here's a photo of 2 different versions of the common "side entry".
On the left is the brand "Elto" as sold in supermarkets and DIY sheds. This is indeed very fiddly - specifically it's very difficult to get the wire to stay under the plate as you tighten the screw. The best tip here is to insert the wire in the same direction as the screw tightening action and keep it close to the screw.
On the right is the "PDL" version (black or white) that is available from Mastertrade and other electrical suppliers. With these you simply twist braids at the end of the wire, stick it in the hole and tighten the screw on the side - easy. A bit more expensive but you'll find them quicker and I think safer to wire.
Note these are 10Amp plugs. No fuse is used as there are circuit breakers and earth leakage trips on the distribution board.