Help Please with shoulder shaping

[Marly1]

I'm pretty new to knitting, and I know you've had questions similar to this, but any help you can give me would be great. Pattern says: Work 25 sts, join 2nd ball of yarn and b/o center 25 sts, work rem 25 sts. Did that. Here's the confusing part: Working both sides at once with sep balls of yarn, b/o 5 sts at each neck edge, and at same time, b/o 10 sts each shoulder edge twice--no sts remain.

Question: In what order do I b/o the stitches, and over how many rows am I shaping the shoulder? Are the b/o every other row? From what I've read, one shoulder will have one row less than the other shoulder.

Can anyone help with this? Thanks!

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