To make thick, hard toenails easier to trim, smear a lot of lotion on the toe nails and wear socks to bed the night before clipping them.
This will soften the nails. To soften your toenails further, soak them for 20 minutes in very warm water before clipping them.
After you towel off, gently stroke the surface of the thickened part of your toenail with an emery board.
This filing may thin the nail by taking off upper layers.
Lisa says, "I have elliminated thick hard (toe) nails by applying store-bought white vinegar to the nails once daily. Took a few months but was very effective. Nails that were previously thick are now completely normal."