What she has done once, she remembers in form.  But no two pieces of metal are perfectly alike and she must each time exercise thought and skill, and the art of striking a magical hammerblow with perfect precision is not yet something she has mastered.

If she goes too fast, she will fail.

But how fast is too fast?  She cannot find her limits without pushing herself.  If you cannot remember a recent time that you have failed, you have been playing underambitiously and under your level.

What she has done once, she remembers in form.  But no two pieces of metal are perfectly alike and she must each time exercise thought and skill, and the art of striking a magical hammerblow with perfect precision is not yet something she has mastered.

If she goes too fast, she will fail.

But how fast is too fast?  She cannot find her limits without pushing herself.  If you cannot remember a recent time that you have failed, you have been playing underambitiously and under your level.