NOTE: Whether you're using a toenail file or a set of toenail clippers or ingrown toenail files it's of the utmost importance to use sterilized instruments that have been disinfected by washing in scalding water and preferably also applying some sort of bacteria killing cleaning agent like the proper soaps or chemicals for this job. Alcohol swabs might be an excellent option but depending on the issues you're having you'll probably want to consult a professional physician before taking any drastic measures like an ingrown toenail operation. Just keep in mind that you should use common sense when approaching any attempt to take out an ingrown toenail.
For ingrown toenail products like a toenail file check out the past post on this specific subject.
Below are images of ingrown toenail filing and also options for affordable, quality files: