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File in one direction only. This prevents roughness and weakening of the nails.
Go slowly at the beginning; this ensures that the nails look even and smooth.
Other techniques to get that perfect set of nails include: buffing, polishing, and cuticle treatment (or cutting hangnails).
If you can, go to a nail salon or beauty supply store and buy salon-grade equipment. It is inexpensive and often of a higher quality.
If your nails are too short, you may want to try something more simple like the oval instead of square or pointed/almond.
If you are using glitter nail varnish, it is difficult to remove so don't bother removing it. Just file it down a bit when it starts to break up and add another layer. This process works well on the nails. For some reason whatever the ingredients in the glitter nail varnish, it definitely makes the nails harder and with prolonged use there will be a difference in the nail strength.