How hard is it to cancel The Economist subscription?

I'm curious to know, how difficult is the process of canceling a subscription to The Economist? Do they make it straightforward and hassle-free, or are there hidden steps or fees that one might encounter along the way? Is it as simple as a phone call or an email, or is it more complex and time-consuming? And, if I decide to cancel, how soon would the change take effect? I'd appreciate your insights on this matter.