I'm not sure what you mean. The Kobo should just appear in your file manager as a removable drive or in ADE/Calibre, and you just copy/paste the files across. Very little out there is much simpler.

Slight deviation of topic, and I know bookstores are different, but I just wanted to say that, as someone working in electronics retail, blanket change of mind returns policies are a major pain to deal with. Customers return products badly repacked or not even repacked at all. Sometimes, there's packaging missing, and the company I work for, at least, has a minimum 10% off all returned stock, and customers tend to demand more off. So stores end up losing money because someone didn't like the colour or didn't like how the light reflected off their screen. (Or worse, they've bought a 40"+ TV for a sports match and returned it the next day. Actually happens.)

This tends to be why you'll find places which won't accept change of mind returns. The retailer I work for used to have this really popular 14 day 'no questions asked' returns policy for over a decade, but then head office slowly realised that the company was losing a lot of money because of it. Mondays have been a lot slower since the returns policy was removed, I can tell you.

If they won't accept it because it's faulty, then there's something very wrong and iffy going on there (in Australia, the national consumer law specifically states that a retailer cannot refuse to deal with any faulty products it sold, and I get the impression that Canada has a similar thing), and you'd be right to be a little suspicious.

But I just wrote this to say that, from the other side of the counter, accepting returns for simple changes of mind isn't always that simple. Or nice to deal with. Not saying it's not great for customers, and bookstores tend to be pretty good about returns. At least, Borders and A&R over here were before they went into administration and all their physical stores closed.