It's an incredible dress, and you look beautiful! If it feels to much, wait till it's in... It's easy for them to take off some of the tulle, or reshape it. It will be fine when you try it on. Don't keep shopping, just try to be patient. If you really hate it, that's different... But if you just feel like it's too much, hang in there, and you'll be ok when you get with the seamstress :-)
I love the top and the back. They're beautiful. Is the tulle on the bottom giving you second thoughts? You asked for honest opinions, so I'll be honest. There's something about the tulle -- maybe there's too much of it? -- that throws me off a little.
For me, a dress in this silhouette would be a second guesser ... but you look amazing in this dress, what is there to second guess? It looks like the dress was made for your figure! I say go with it. Not my style of dress, but you make that style look great. Seriously.
I'd have the seamstress cut out some of the tule in the front unless you want to keep that dramatic mermaids look, but other than that I think it looks lovely!