Be yourself ofc…but also there are some things you don’t need to reveal—ambiguity, doubts, for example. I had a few job interviews where I was really honest and said that the position would be a chance for me to ‘explore’ XYZ profession when I should’ve lied and said there was nothing more in the world that I wanted than to have that job and do that work. In other words be enthusiastic and act committed — good luck!