Would it be rude of me to ask why anyone should be filing their own nails?
Why not just learn to hold your clients fingers so that your nails do not get in the way? As the Meercat says .... simplezzzzz!
1 Hold the finger with your thumb and index finger
2 Tuck your middle finger right under the finger you are holding to support the finger while working.
3 Last but not least ... this is the important bit ... cock your wrist so that it is at right angles to the finger so that the base of your thumb is nowhere near the finger instead of all scrunched up against it! (Your elbow should be angled out instead of by your side) This opens a huge window in which you can work and your own nails are nowhere near the file. PLUS your arm is supported on the table (as your other arm should be) which will eliminate any elbow or shoulder aches forever!! Voilà