I am going there for less than 3 weeks but am considering learning some basic conversational Catalan.

How necessary is it to learn Catalan if I already speak Spanish fairly well?

Is it easier to navigate the city with it?

Does anyone know of reputable teachers, schools, short term classes in Barcelona to study Catalan? And the costs?

Can you tell about your experiences learning Catalan if you have done so in Barcelona?

Thanks.