When is it safe to pop?

I was just wondering when is the appropriate age/weight for popping? i have ten balls, and all of them need to be sexed, so i was wondering when i would be able to do it ( i am too nervous to do a probe haha) they range from 45-65 g.s, and none have eaten yet.

If you know how to do it properly, you can do it as soon as they are hatched...

thanks, one of my friends said i should wait until 130g to pop, but i wasnt sure, even though she has over 60 bps of her own haha but i did it, and 'stuff' came out (i dont know why i wasnt expecting it haha) but i think i have 2.8 normal! thanks for the advice!