Tough one...
Probably:
"Don't overthink this! You like her and you say she's showing signs of liking you! Just do something fun with her, and ask her out while you're both enjoying yourselves. Don't try to be all over the top romantic, just ask! You're both friends now, you've been hanging out a lot recently, and you're both getting along great. So stop self doubting and overthinking and JUST DO IT".
That helped me a lot. I was freaking out about what to do prior to asking a friend for what to do to.
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Another piece of advice I'm working on using is "When life feels impossible and you feel all negative, just think ONLY of the present moment. That will kill off your negative feelings and your ego, and make things feel a lot more possible"
Also, "Know when to fold 'em" is something I've always lived by. If I look like I'm totally screwed and I can still bail, I will bail. This makes my best friend really mad though, since he feels I give up to easily (he, in contrast, NEVER gives up. He does NOT know when to fold 'em. Although he's got enough sheer determination to make almost everything work out for him in the end)