Raff's take on the bolero is structurally more complex and harmonically adventurous than most salon versions. It incorporates virtuosic flourishes that demand significant technical command.
Mastery of the left-hand rhythmic ostinato is essential for providing a solid foundation for the complex right-hand phrasing.
Bolero is rated Henle level 6 of 9 — advanced repertoire, roughly ABRSM grades 7–8. In the RCM system it corresponds to about level 8.
You should be comfortable at Henle level 6 — meaning you can already play level 5–6 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 Bolero lasts about 6 minutes.
Bolero is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.