Is it hard to hang wallpaper that is not prepasted?

My daughter spent weeks picking out the most darling wallpaper for her bathroom. Just as she was ready to order it, she realized that it is not pre-pasted. I have only hung prepasted wallpaper before, and that was a long time ago, so I am a little nervous. If you have any experience with wallpaper in general, and especially the kind you have to paste yourself, would you please give me some helpful tips. Thank you!