How to buy skates online?

There are many websites that sell hockey skates on the net.. but can anyone tell me if there are any specific things that you need to keep in mind while buying skates off the internet? I know it’s a different thing altogether when you buy them from a shop; you get to wear them and stuff. But off the internet it’s different. I don’t like buying them from a shop as I hate the shopkeepers who try pitching the costlier and most often the less functional varieties to me. So if someone could tell me what exactly are the factors you need to keep in mind while buying the skates online, that would be great. I know my skate size and I already have a Easton skate that I brought off a shop, so I am aware of sizing issues and the brand I need. Is there anything else apart from this that I need to be aware of?