Naderman's studies for harp explore various technical aspects and lyrical possibilities of the instrument. They are known for their elegant writing and melodic grace.
Focus on creating smooth arpeggiated figures and maintaining a clear, singing tone.
7 Etuden für Harfe is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
7 Etuden für Harfe is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.