My experience with walking-and-using is that, quite counterintuitively, messing is actually easier than wetting while walking normally. I managed to master messing while walking on my first serious attempt, even though it took me a few hours, whereas wetting myself without interruption took many, many tries. See, even if you start pissing and the take some stepst, the stream gets cut short pretty quick. For messing it was easier to just relax after holding for a few days, even though the mess wasn't that soft, I walked for some 4 hours looking at my phone until it started happenning, and it all came out in 2 waves. Still now, pissing takes some intentional pushing while walking, but I can put in the back of my mind and hold a conversation while walking-and-wetting.