ST. PAUL  Gov. Sarah Palin could not have asked for a better setting for her solo debut on the national stage: an audience enthralled with her selection as Senator John McCain’s running mate even before she walked on stage to a roar of approval, after three days in seclusion with some of the country’s most skilled political counselors to write, hone and practice her speech.

She drew warm applause as she described her life in Alaska and introduced her family. She heard cheers as she promised an aggressive energy policy that included more drilling. And Ms. Palin ignited a loud round of approving boos as she denounced the news media and “Washington elite” that she suggested had ganged up against her since Mr. McCain announced Friday that she would be the Republican vice-presidential nominee.

But her speech at the Republican National Convention, if delivered with confidence and ecstatically embraced in the hall, may prove to have been the easy part.

From here, Ms. Palin moves into a national campaign where she will have to appeal to audiences that are not necessarily primed to adore her. She will have to navigate far less controlled campaign settings that will test not only her political skills but also her knowledge of foreign and domestic policy. And she must convince the country she is prepared to be vice president at a time when the definition of that job has been elevated to the status of governing partner  something voters might have been reminded of Wednesday by images of Vice President Dick Cheney embarking on a mission to war-torn Georgia.