Sewing Cups into Dress - Questions

I just scheduled my first alterations appointment for mid-August, which means I need to figure out my undergarments situation quickly. I tried on my dress originally with

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How to Sew Bra Cups into Dresses

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How to Sew Bra Cups into Dresses

Question for tailors: how would I bring in the cups on this dress to fit? : r/sewing