Morning Anne
Not sure if you can get an oral anti-b for pigs, but it may be worth you asking your vet. Before getting your vet out it may also be worth checking with your vet if it would be cheaper for you to take the piglets down to them, to save call-out fees.
Don't worry about not being confident with jags - it doesn't bother me, as I've been around animals all of my life & worked on a hill farm in Wales as a teenager. But my OH won't even attempt it, but is quite happy culling poultry - which I can't bring myself to do.
We all have different skills & abilities - doesn't mean we don't care for our animals