Learning spanish at Gibraltar

Hi there,
My family and me moving to Gibraltar after living 6 years in UK.
My husband will work over there and me I have to find a job as a nurse.
Could you tell me if its difficult to work as a nurse if I don't speak Spanish yet?

at the moment I work in Bristol in Endoscopy and a bit stress to live my job and go to Gibraltar.

There is only one official language and that is English.