Hi OP, I was diagnosed about a month ago (I never had it in my previous pregnancies either) and for the most part it’s not been too bad. I’ve found that recently I’ve become more sensitive to bread so have completely cut it out now, and get my (very necessary) carbs from sweet potato, spelt pasta, chickpeas etc. I check my blood a lot, it helps me feel more confident that I know what I can/can’t eat. My blood sugar tester is synced with an app that my hospital use, so they get my results as I put them in my phone. Then they send me a message once a week (via the app) to let me know what they think of my readings. So far I’ve been able to control with diet (and exercise - if you do 20/30 minutes of what you can, the muscles utilise the glucose and it helps to drop your sugar levels) and water it super important.
Try to remember though that if you can’t control with diet, it’s not your fault, your placenta is just interfering with your carb tolerance more than can be managed with diet alone, and you need carbs for the baby, so do what you can but don’t stress too much if it doesn’t work. The gestational diabetes website has a lot of info, but basically you need to cut out refined sugars/carbs (white bread, pasta, and obvious sugars) and pair fruit with high fat food (yoghurt, peanut butter, cheese) to slow down how quickly you metabolise the fructose (fruit sugar) in them so you don’t get a big spike. Eggs are your best friend.
I have to say, a couple of times it has got me down a little, just because I’m 34 weeks and sometimes I just feel too exhausted to drag my ass for a walk, or I feel like I’ve eaten a perfectly diabetic friendly meal and my sugars run high anyway, but overall it’s been okay. My DH has made it a lot more manageable.
Good luck!