I have to shape and file down every 3 days,its critical to tone and attacking the string correctly.My trim warning signs are ..1.speed slows down 2.clanking sound of the string sliding off the skin to the nail.

If you'd like to see some prep work put into nails check out Pierre Bensusan,he actually builds his up with false nails and acrylics,he achieves such a wonderful and unique style through doing it.