These chorales are Bach's renowned harmonizations of Lutheran hymns, demonstrating his profound understanding of voice leading and harmonic structure. They serve as fundamental examples of Baroque choral writing.
Practice bringing out the individual melodic lines while maintaining harmonic clarity and a sense of devotional reverence.
383 Chorales is rated Henle level 1 of 9 — beginner repertoire, roughly ABRSM grades 1–2. In the RCM system it corresponds to about level 2.
You should be comfortable at Henle level 1. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
383 Chorales is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.