1️⃣ Using the wrong fingering—or one that’s simply uncomfortable for your hand. 
2️⃣ Unsupportive timing and phrasing. Sometimes you actually need to highlight the tricky notes phrasing-wise, instead of instinctively hiding or rushing them.
 3️⃣ Wrong practicing habits: repeating the same mistake over and over just engrains it deeper. ✨ Try another approach: * Switch bowings (e.g. detaché instead of legato) * Change rhythms (e.g. dotted notes instead of straight 16ths) 4️⃣ Try to let go of the idea that you’re bound to make a mistake in difficult passages. So often teachers have told me, when I started practicing a new piece that I had never heard or played before: ‘Watch out, this is a difficult spot, everyone always has trouble here.’ Without having any experience of my own yet, I already had the mindset that this would be a problem for me. To get rid of this I like to trick the mind: Try a more difficult fingering you wouldn’t normally choose, then return to the ‘normal’ one. The psychological effect of this is that the ‘normal’ fingering suddenly feels much easier than before.