You need to start thinking of it as a lifestyle, not a diet. It won't end (or if it does, you'll undo all your hard work). This is forever now. Obviously, at some point, you'll reach maintenance, but the training and thinking about what you eat, and tracking food to some extent, has to be forever.
You do get used to it, and it becomes second nature once you get into the groove. Meal planning gets 100% easier once you have a feel for what fits into your nutrient goals and find a few favourite meals.
Training becomes enjoyable, for the most part. I started running about 6 months ago, and I hated it with a passion. It was a struggle to even convince myself to put my running shoes on, much less jump on the treadmill or head outside, but I look forward to running days now, mostly. You'll still have days like I did today, every now and again, where just the thought of a training session feels like effort, but they become few and far between.
I've been into weightlifting/body-recomp/bodybuilding on and off since my late teens because it helps me manage my food issues, but even now, I have the odd day where I'd rather drop an 18KG kettlebell on my foot than do a 20-minute EMOM session with one.
If you don't love it within 6 months, swap something around, try swimming instead of running, a group strength class, or CrossFit instead of what you're doing with your PT etc.
If you're stuck for meal plans or fancy trying something new, plug your goals into ChatGPT and ask it to create a meal plan. Just make sure you sense-check the results. I find it to be way under on cals but pretty spot on with protein.
And when you feel down on your progress, or what feels like a lack of try, remember how far you've already come. It's not a race; there is no deadline, as long as you keep plodding on, you'll get there.