This is a modern, minimalist work that focuses on the concept of 'self' as a melodic exploration. It is distinctive for its sparse, intentional note choices and reliance on silence as an structural element.
The player must have absolute control over touch to maintain the intended intimate atmosphere.
Comparable difficulty and character — good candidates for what to learn next.
"of being a self in a song" is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 6.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of "of being a self in a song" lasts about 3 minutes.
"of being a self in a song" is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Ave Maria d'Arcadelt by Franz Liszt, Ave Verum Corpus de Mozart by Franz Liszt, Albumblatt by Johannes Brahms — see the full similar-pieces list on this page.