I have used an emery board, and it is useful to get the sharp tip off of their nails. To be honest, I have yet to perfect a way to trim their nails.
A couple of days ago I took two of my babies to my ex for help with a trim, because I have a hard time doing it alone. One of my girls has hands that I swear are stronger than mine! We gave her a stick to hold while we trimmed the nails.
They sell mesh pouches to put them in for trimming, but the one I bought was too small to stuff her fluffy self into! I am going to try to make my own mesh pouch before too long. For now I just clip whatever claw sticks out through the bonding pouch window.