I agonised over that story. Mostly because it needed to be romance, and I was struggling with that a bit. But Nikki Magennis helped me get it right by making excellent suggestions, and I was able to do what was needed. I think a lot of the things that I was complimented on were down to Nikki's salient points.
It's tough, the editing process. I can't recommend getting someone to help you with it enough. Others will see things, ask questions, suggest things and pick at holes - when left to my own devices I tend to just change words to other words and dither over commas. With this one, as with others, I tied myself in knots trying to do what Nikki suggested - at first, my reaction to the notes tends to be, 'What? How?? YOU change it!' I wrestled with this one, and arghed a lot, and nearly didn't do it. I'm glad I did, though, I love the book, and I love the story, and if I'd any gumption I'd have written a prequel novel by now, but ... oh well.
So - I think that editing help allows you to write stories you are really proud of. Nikki helped me, yes, and I'm delighted at her input, but at the end of the day, it's me who decided how to act on those suggestions and adjust the story... I don't feel like it's any less my story. I think it's a skill in itself, being able to rework something, decide what advice is right and what you don't need, take out bits, write endings... it's what we do with edits that makes us writers, as well as what we write in the first place. It may be a painful process... but it's a good one!