The harp is kind of an in-between instrument. You cannot hire a harp tuner to come and tune your harp once a year, the way you might with a piano. Instead, you have to tune it regularly yourself, just like you would with a guitar or a viola. At the same time, there are a lot more strings than other string instruments and each one needs to be tuned individually. To further complicate matters, student harpists don't usually bring their harp to every lesson and consistently work on their tuning skills with their teacher the way most orchestral instrumentalists do. Instead, it is common for the teacher to provide an already tuned harp for lessons. Certainly you can still work on tuning skills with your teacher, and might take your harp in from time to time with questions, but frequently tuning is something you find yourself at home trying to figure out. 

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To help with this, I made a series of videos, covering different aspects of tuning. You can explore these below.