Is texting a good idea or should I just man up and call?

I agree with the other 2 answers. If you're too nervous to call first, leave a text. But you will eventually have to pluck up the courage and just call! I know it's scary sometimes, but you feel so much better after you call the first time (if things go okay).

Text her at first then tell her to call you.

A few texts back and forth are fine. You can gauge how quickly she responds, how long her message is and how much she's flirting. Based on those factors, you can decide whether to call.