My students can do nail varnish properly and I am guessing they don't shell out for manicures, so I refuse to believe that's the solution! 
Whenever I do mine I end up with bits of varnish on the edges and they look a bit raggedy. Is it just being steady-handed or is there some kind of trick?
(I cannot believe I am wasting the time of a whole forum of woman with stupid questions like this.
)