Just the piglet number

Start with the boars and do them 1,2,3 etc then move on to the girls.
It's
double tagging that's not permitted for shows Mrs S

(Though hopefully the BPA will sort that rule out soon, cos it's just not fair on those who don't want to notch/tattoo IMHO)
So you'll have a tag printed with the pigs individual number (to correspond with the notch) and your herd mark in one ear and your notches on the other. You'll eventually end up with notches on both ears (once you get to piglet number 100)
And I would also
strongly recommend tagging at the same time - I had the bright idea that it would be easy to identify them from their notches and get tags in at a later stage

It would have been easier just to do both at the same time

I did mine at a fortnight old (when they were really easy to hold

)
Good luck and let us know how you get on
