How do I file my greek girls beak

[NovaLove]

I watched a video of a woman showing how to file the beak of a tortoise. She showed a really good instruction with a little nail file but her tortoise is smaller then mine and she could fit it in her hand to hold while filing.
My two 13 year old Greeks are bigger and I can't hold them with just one hand.
Any tips for me?
They have a calcium stone (or maybe it's called sepia stone), can that help them file their own beaks?
Thank you

 

[Kim&Tim]

I watched a video of a woman showing how to file the beak of a tortoise. She showed a really good instruction with a little nail file but her tortoise is smaller then mine and she could fit it in her hand to hold while filing.
My two 13 year old Greeks are bigger and I can't hold them with just one hand.
Any tips for me?
They have a calcium stone (or maybe it's called sepia stone), can that help them file their own beaks?
Thank you

Yes that helps, feeding on a terracotta tile or something similar rough/stone also helps. Also having them actually rip leaves etc, instead of little pieces also helps. The beak has to work. If I where you I would do this with 2 people, 1 holding. If you're unsure how to do it, go to a reptile vet and can show you how to do it correctly.