Quick Harp Part Etiquette Question

So in this piece I'm working on, there is a part where the harp plays alternating C major and Ab major chords. Now, I don't know a ton about the harp, but I from what I know about its pedaling system, I think a good way to do this would be if the harpist actually plays C-Fb-G followed by Ab-C-Eb, so they don't have to switch from E to Eb in the act. My question is, how should I notate this? Should I write it in this enharmonic notation (even though it looks funky to me) or write what the notes "should" be (C-E-G, Ab-C-Eb) and trust the harpist to do the sensible thing? And should I give some warning to the harpist in the preceding rests about how their strings need to be tuned?

Thanks,

DP

Notate it enharmonically as Fb. It may look strange to you but a harpist won't be phased by it, they are used to seeing things like this all the time. You need to indicate the change of tuning in the space between the bass and treble clefs but it ideally needs to be done a few beats ahead of time as the 3 pedals that would need changing on this occasion (assuming you were just in C major to begin with, I don't really know the context of your piece): A, E and F, are all on the right side of the harp so they all have to be changed separately with the harpist's right foot and harpists prefer to change pedals once on the beat if possible.

If you want to get a better feel for harp notation why don't you type something like "harp concerto" into IMSLP and have a look at a few scores to see some real examples.

Thanks, that is exactly what I needed to know!