Hi.... One piece of advice my friend.... don't fall into the trap of telling her you like her, and then start blurting out how madly in love you are or anything. Would really frighten the poor girl... even if she was interested she would probably react badly.
I always try to joke my way into a date.. Do something like this in the middle of a conversation...
You.. so, you got any secret admirers?
Her... No, not at the moment....
You... I bet you have... Your too nice not to have any!
Her... Nah... no one.
You... Well, I always have a great time with you. Being with you is always good fun.
Her... Yeah, I like you too.
You... well... I can at least flatter you a little... I am a bit of a secret admirer of yours...
Her...
The last bit obviously is unknown, but you can take it as an example of how to work your way into telling them how you feel without sounding desperate or like a complete idiot. This is a good way of doing it because her repsonses will be limited so you are in control of the situation. If her response is negative then you can always joke about her still not having any secret admirers cost the last one just owned up... and then say something like "I doubt I would do anything because I wouldn't want to ruin our friendship...." If her repsonse is positive you can then say, "fancy going to the cinema, just you and me?"
GO ON GO ON GO ON GO ON
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The last thing I want to do is hurt you. But it's still on the list.