Yesterday, I helped my client to upgrade some of her WordPress-powered blogs. When I ugpraded WordPress — mine, friends’ or clients’, I found it very easy; and the process run smoothly. The only difference — when I updated my client’s — was that it was a big-jump upgrades: from WordPress 1.5.2 to 2.5.1. I used the standard procedures: backup, backup and backup. Not only the databases, but also the core files. Luckily, my client does not have many plugins installed.
In short, all worked without problems. It took one simple click after uploading the new files — sweet!