Yes, we pH HEPES using NaOH (preferably 10M, added dripwise with a pasteur pipette); if you go over the target pH (try not to) then use HCl. Different buffers may use different chemicals for this purpose, like NaH2PO4, sulfuric acid, citric acid, etc.
As Tydra says there should be protocols laying around. You shouldn't worry about asking questions like this in the lab if you're a student.