There is a tool nwc2abc that takes NWC files to ABC. If it works for you, it may be your best choice.

Going via MIDI files with the usual tools works OK for about 90% of all folk tunes, but the spelling of accidental accidentals may go wrong, e.g. a flat instead of g sharp. Some tools are better than others, but none can be perfect.

If you are happy with either solution, there is no need to learn ABC for the current purpose. On the other hand, some virtuosos believe it to make for faster input than handling with the mouse, or drawing five lines on a sheet of toilet paper when inspiration strikes. Others (including myself) appreciate that ABC code can be read from the web page directly - after some training.