TL;DR: I prepared my AWS Summit Hamburg talk through 6 recorded dry runs, each analyzed by a structured AI skill. The skill transcribes via Amazon Transcribe, counts fillers with word-level timestamps, checks customer references against a checklist, flags pronunciation issues, identifies filler-dense windows, and proposes tighter alternatives. This post shows the complete skill file with every step explained, the real results (um: 80→27, customer refs: 0/6→4/6), and the key discovery: the skill and the talk improved together. Each dry run made both better. Total cost: $3.60 for 6 analyses.