Hi Bazza and welcome to the board.
I'm a type 2 since January, currently diet control. I've been doing a lot of blood monitoring since then which has helped me get my head around what everyday life can include food wise, but also helped me think about what I am going to let myself have as treats.
One of the upsides for me of the lowered carbs is that I feel a lot better than I did. I rarely wake with a muzzy head and am generally just a lot perkier than I was. I'm no saint, I've had plenty of soddit moments along the way, but what I've found is that if I do go OTT on the carb front I feel almost as though I've got a hangover the next day - alright, not a banging head but thirsty and tired and crabbit. That has kind of taken the shine off things that I used to think of as treats; I like the idea of half a packet of chocolate digestives but I don't like the reality.
That's not to say that I don't have treats, but they are smaller than I would have had before and if I've decided to have some chocolate I'm likely to fit in an exercise session (I go for long walks) before I eat it to help my bod deal with it.
I have found that I can keep my blood sugars reasonable-ish if I have between 75-100g of carbs a day and try not to have more than 20 g carbs at any one meal. Translating that into treats, a Lindor fondant egg (28g) comes in at about 11g of carbohydrate, so if I was going to have one I would be looking to make low carb choices in the meals around it and go for a walk first. I know that that doesn't sound like much of a treat because I'm working for it, the up side is that I feel ok the next morning.
You'll figure it put as you go along. If you're very active then your treats might involve a lot more carb than I get away with, you'll only know that by testing, testing, testing. Also, there are plenty low carb cook books out there, I've got a lovely recipe for a chocolate almond cake that when I've figured out which sweetener tastes best will be a real regular treat and the non diabetics in my family certainly don't hestitate to eat it whilst my back is turned.
It does take a bit of getting your head around, and you will have slips and trips along the way but you'll find plenty folk in here who know what you're feeling and will help you figure out what's right for you