Try reading all the messages about faster solving, guessing, etc. Also, make sure you read the each clue carefully and completely. Pay attention to all the details - if Pablo arrived before the root beer drinker, then Pablo is not last, the root beer drinker is not first and Pablo is not the root beer drinker.
When you have a match, make sure you eliminate all the negatives for both. If you keep plugging along, you will get the hang of it and find yourself zipping right along!