One: develop your own talk and slide deck.

It is possible you will choose not to do this.

Barring that, have a plan for recognizing the guy who you're stealing from so you can react if you see him in the audience. This may not always succeed.

One way to better prepare for this possibility is to have some idea who is attending the conference. While you may not be privy to who all the attendees are, there may be some ways to recognize if your source will be at this conference where you're speaking. Like, for example, if they are identified as one of the featured presenters at the conference.

Should you steal, you may want to make some minor edits to the slide deck to partially obfuscate that it's been lifted. You may need to make more than minor changes to accomplish this.

You may also wish to make those edits ones that do not demand quips like "the only edit he made was to remove "lack of perseverance," which is pretty well covered by ripping off someone else's talk."

Another good practice is to lift from someone who has class enough not to respond extremely overtly. Some people lack restraint.

Luckily, sometimes being pathetic is enough to get you off the hook.