Hiya,
As SfS says, if they've got worms you'll have them in your ground already. Best thing to do at this point would probably be get a worm count done to check and then decide on a treatment.
I used to use Flubenol (it's an oral worming powder, but doesn't treat external parasites - so you still need to treat for them seperately) but have changed to noromectin lately (it's a injection though) Panacur is a good oral one - but only comes in massive quantities, so for 6 pigs it would be terribly expensive.
Give as much pasture as you can to them (they'll stop rooting once the grass is up) and this will encourage them to graze, they'll only need about 1lb of food a day each if under a year and the adults will be fine on grass and fruit & veg alone
Kune Kunes are generally really sociable, friendly wee pigs and will respond very well to human company - can I suggest you take a couple of hours every week and spend a bit of time with them ? They'll come round REALLY quickly (especially with a pocketfull of grapes or bananas) you'll soon find they'll be clambering all over you and checking ears, teeth, feet or doing injections isn't any problem at all.
HTH
Karen x