Back again! Sorry; bonkers week going on here...
The strangest thing about the wet stop was that it worked - even though it didn't seem to be having any effect whatsoever. So that's the first thing: it's worth sticking with. The second is to decide beforehand with your DH who will be getting up, as it makes a right old mess of your own sleep, and you'll need to take turns. It really felt like having a baby - remember that feeling of staying awake reading because you know you're going to be woken up again soon anyway? Yep. It's like that...
We did try to up daytime drinking, but DS has always been ok with that, and guzzles a fair amount of water anyway. We did try limiting fluids after 6pm, but it had bugger all impact on either his need to wee or his capacity to wake up for it, and we felt very uneasy about expecting him to go straight to bed after Beavers or an hour of sport without having a drink. So we kind of ignored the advice on avoiding fluids from early on, apart from not letting him have a drink in his bedroom any more.
DS is something of a techie, and so was quite excited about the whole thing, which helped, as he was very interested in how it worked. The sensor is very, very sensitive (see earlier posts about sweaty bits and dewdrops, boak) so make sure you have dry hands when setting up.
It clips easily into pull-ups, but needs to go right to the very bottom so that it's in the right position when they're pulled up. The instructions are clear, and we followed them to the letter, apart from the bit about changing the sheets, as they don't get wet with pull-ups. It was heartbreaking at first, as you have to make sure that they wake up and then get up and go to the loo, even if there is no wee left to wee. It's important that they switch the alarm off themselves, which sometimes took blimmin ages. The alarm has to go on their pyjama too, as when we tried it on his waist band he didn't even stir. We realised just how deeply DS sleeps, hearing it through two doors and a flight of stairs, while he snored on. You then have to make sure that they're completely dry (old towels or face flannels are handy for this) before helping them to change.
It was handy noting patterns that helped us to see when he weed, that it tended to be only once each night, etc. The sticker chart comes with it has helped, but we have tried to play down this side of things, as not getting one is, of course, beyond their control. He's enjoyed adding one each morning ever since, though.
I really hope it works for your DS, Egg: it had made a visible difference to our DS's confidence and it obviously flipped a switch for him somewhere in the depths of his mind.