I was back in pull ups briefly at age 6 after toilet training for constipation issues but don't recall using them much, really. So, the first time post-toilet-training that I actually got a diaper and used it was very recently, a few months ago, when I got a Walgreens Certainy Brief and wet it. Not a great first experience haha, those things suck. I immediately the next day picked up some pampers diapers and stuffed them in to make it tolerable, and then eventually just switched to stuffing the baby diapers in underwear which was easier and did a similar job, up until recently when I got ConvertUps and now wear baby diapers most of the time. But, I'm gonna start opening it up to ABDL diapers soon, too, as I start buying even more.
While I enjoy wetting them, my fixation since I became a DL was always on messing, and I went 20+ years messing my underwear directly, not even trying to make fake diapers, and I enjoyed it a lot. It's become a habit of mine to usually, but not always, hold a mess so I can do it in my pants in private (although now its in diapers which is an easier clean-up).
I'm so glad I decided to do it, because it is a big difference. I wish I started earlier.