I never got explicit instructions about how to do it - although I was advised to take at least a week. They seemed to leave the rest to commonsense, so (a) they must trust I have some (that’s good!), but (b) I deduce it can’t be that critical.
So I came off much the same way I went on. I’d worked up to 900mg (3x300 daily, divided doses) by adding 100mg a day.
When I came off, I still had some 100mg tablets left (along with 300s), so by mixing and matching, I reduced 100mg a day, as well - so eight days, counting from the first day I took less than normal.
There was a period, about two or three days in (from memory) when I thought I’d done it a bit fast, and should have “plateaud” a bit, before reducing further. This was because I got a slight rebound reaction of increased tingling in my fingers - which was NOT the reason I took them, and had never really bothered me previously. So I did worry, at first, that they’d made me notice a problem I’d previously tolerated, and that I wouldn’t be able to stop.
However, this phase with the tingling stopped. I don’t know if it actually reduced, or if I just got more used to it again, so it didn’t trouble me any more. Apart from that one nuisance, I didn’t have any other adverse effects of withdrawal - certainly nothing worrying. So my advice is to play it by ear (but if you’re on 300s, you may need to get some 100s, so you can control it more finely).
If, at any point, you get withdrawal effects, you can either stay at that dose for a while until they resolve, or even go slightly back up temporarily.
For me personally, stopping them proved I’d not been benefitting. Once things had stabilised, I was definitely not any worse without them - all much the same.