The most effective way to do it, is to do it

We can confirm this line is very widely and consistently credited to Amelia Earhart — it even appears on the official Earhart licensing site maintained by her estate's representatives — and we found no rival claimant to challenge her authorship. What we could not find is a primary source: the exact wording does not turn up in the leading published collection of her correspondence (Jean L. Backus's Letters from Amelia, 1901–1937), in her lesser-known writings and speech material, or in any reprinted speech. Popular quote sites offer conflicting and unsupported provenance ("from a letter to a friend," "from her writings and speeches"), which is itself a sign that no one is working from a documented original; tellingly, the line is often printed run-on with her separate reflection that once you decide a goal is worth the risk you should "stop worrying." Absent a traceable letter, article, or address in Earhart's own hand or voice, we classify this as attributed rather than verified — a genuine and characteristic-sounding sentiment broadly linked to her, but not yet anchored to a confirmed source.