This is a somewhat unusual piece that sounds more difficult than it is. Although it can be challenging at times, it's also fairly short with repetitive sections.
Difficulty = Moderate
The Bach inventions are an important part of any aspiring pianist's repertoire. Despite being very technical, this invention is among the most accessible of all inventions.
Difficulty = Challenging
Beethoven's Sonata No. 20 (Op. 49 No. 2) is widely considered to be the best choice for any pianist's first sonata. Compared to sonatinas, this sonata is generally longer and more technical. However, it's also the most accessible among all Beethoven sonatas.
Difficulty = Very Challenging