If someone is very annoying and always disturbing you, they are a pain in the neck.
Pain in the butt, or pain in the ass (USA), and Pain in the arse (UK) are less polite alternative forms.
When someone gives you a pep talk it is to build you up to help you accomplish something. In sports a coach might give a player a pep talk before the game to bolster his confidence. At work the boss might give you a pep talk to get you to do a better job.
A photo finish is when two contestants (usually in a race) finish at almost exactly the same time, making it difficult to determine the winner. (The saying stems from the practice of taking a photograph when the winners cross the finish line to determine who was ahead at the time.)
(USA) This idiom is used to express being satisfied with enough, that being greedy or too ambitious will be your ruin.
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