Modifying Existing Trials
Adventures designed for general audiences are likely to contain Trials that may or may not test the Skills held by the heroes. That can take a lot of the fun out of the game! GMs are encouraged to custom-tailor published adventures for their heroes, making each Trial have generally the same goal as the publisher intended but testing Skills held by the heroes.
Remember, however, that Trials in published adventures labeled "Unskilled" are meant to be done without any Skills.