I just gently hold the base of the lash with my thumb and forefinger of my left hand (I'm right handed) and I use the thumb and forefinger of my right hand to grasp and slowly pull the glue away. Sometimes I'll even use my nails a little.
If there's any mascara on the lashes I use a q-tip to remove any product. I then spritz it with 99% alcohol to help kill any bacteria that was on my hands or in my eye and I put back in the box so they'll keep their shape.
HTH!