Beginners usually fail because they jump directly into high-density sheets. Instead, pick songs with predictable rhythm and small note ranges. Your first target is not speed; it is consistency without hesitation.
When one level feels easy, add only one variable: either faster tempo or a longer phrase. Do not change both at once. That single-variable approach keeps mistakes diagnosable.
Use weekly review sessions to replay your first songs. This maintains recall and proves that your foundation is improving over time.