Sharpening saws is no more difficult to master than sharpening chisels, it's just different.
Selecting the correct file for the job is the first step, so all of ours are listed with the range of pitches (number of teeth per inch) that they are appropriate for.
Chalking your files and using them with no downward pressure will help them to slide effortlessly, producing a smooth surface and the sharpest possible edge. Pressing downwards will make a mess of the teeth and probably damage the file.
They will wear out eventually, so we recommend keeping your newest file for 'best', i.e. only using it for the finishing pass, and then gradually relegate them over time.