The only tip I would give is to order a swatch before ordering a bulk of dresses. I ordered the dresses in pink thinking that the colour would be much lighter than it was. I didn't realise I could order a swatch. I contacted customer services about the colour issue and they were extremely helpful and answered very promptly.
I was really worried about ordering a wedding dress online, but it just arrived today (about 3 weeks earlier than expected!) and it is beautiful. I do suggest doing a custom measurement if you're looking to order this dress. I didn't and ended up with a dress that fits perfectly in the waist, but that is too big on top and about 4" too long. Nothing I can't have fixed with some alterations, but it would've been nice to not need to do anything to it.