Tuning the Donner DLH-003 16 String Lyre Harp might take a little time and patience, but it's doable.
It's designed to be tuned to a C Major scale, from G3 to A5. So, you'll line up the strings with notes G3, A3, GB3, C4, D4, E4, F4, G4, A4, B4, C5, D5, E5, F5, G5, and A5. That's according to the manufacturer's detailed info.
Based on what we've found, it's important to know that while many people have successfully tuned this harp by taking things slow, a few folks mentioned some hiccups. The tuning pegs can slip, and occasionally a string might break during the process. So, when you're adjusting the strings, go easy on them.
Another tip is to let the lyre warm up to room temperature before you start tuning. It helps manage tension and could prevent some of that breakage. If those pegs are slipping, there are solutions out there that people have tried and found helpful.
In short, getting the harp to sing in its C Major glory might have its moments, but if you tackle it carefully and let it settle into your space, you'll likely have a smoother experience.
Happy tuning!