How hard is it to play violin?

The violin is definitely more difficult to play and master because there are more variables. Any instrument has a "learning curve" and can seem difficult for the first few days. The trumpet has its "notes" preset in the form of the valves, though you change octaves with your mouth formation.

With the violin you have to learn the positions and fingering techniques to form the "notes" and you also must master the bow. The violin is very tactile and depends upon "finger sensitivity". The trumpet involves mouth formations and could be very easy for someone who finds the mouth easier to work with.

A lot of work is necessary to master any instrument.

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