Glo Changing my email address

I need to change my email address so that I am no longer dependent on an ISP.

What do I need to do to get my kobo account email address changed? I can see on the web under "My Account" that I can simply type a new address in, but surely it can't be this easy. What about DRM, my adobe account and the email on my device - how do they all tie together? I don't want to change it then be unable to open my books.

Any tips from anyone who has done this?

Thanks