Yeah of course the only way for me personally to know if a dress fits is to try it on. However, it's useful to find out from other people of similar height and size whether it worked for them. I always read website reviews for this reason but there are none for this dress on the Hush website.
I am also very used to getting clothes altered but since I live in Ireland and would have to order online, the dress works out reasonably expensive before factoring in alternations. I thought it might be worthwhile to ask opinions before ordering (and people have been very helpful!)