Ellen DeGeneresEllen DeGeneres takes the stage on February 25 as host of the 79th Academy Awards ceremony -- and if she thinks hosting the Oscars is as easy as showing up and tossing off a few one-liners, she's got another think coming. Luckily, she can learn tons from those who came before her, from revered hosts like Johnny Carson and Billy Crystal to unfortunately maligned hosts like David Letterman and Chris Rock.

Take a look at our advice to Ellen, based on the best and worst moments in Oscar host history, and then help her out with your own pearls of wisdom.

CHECK IT OUT: Do's and Don'ts for Ellen DeGeneres

POST: What advice would you give Ellen?

POST: What are the best and worst moments in Oscar host history?