Here is the first one I sewed. I sewed this one shortly after, making some alterations. I thought the sleeves would be cute with gathers, and I changed the rounded peter pan collar to a pointed style peter pan (or, flat pointed, I think they are called).
First, this just shows the bust adjustment i made, taking up the extra slack in the side bust dart. I didn't need to make the whole thing wider, as most FBAs show you to. I don't know if this is proper, but it's what I did.
I attached the cuff, right sides together, and pulled up the gathers in my sleeve to fit the cuff.
Then I top stitched the cuff in place, catching the inner fold of the cuff (so i didn't need to hand stitch it in place.)