I still keep a diary even 8 months in and find it helps.
My tips would be:
Think of as many types of veggies as you can to fit in each meal. I'd also recommend making a tasty fruit salad in the evenings to take to work the next day.
Plan ahead! I do about 3-4 days at a time, sometimes a week, including the hexes.
I find I do better if my meals are mostly synfree, and I try to save my syns for the evening. Not all the time (eg some healthy syn-heavy avocado in my lunch can be great!) but when I need to get back on track this works for me.
Don't get discouraged if some weeks you don't see the loss you were expecting (and sometimes do better than you expect!) Especially for women, bodies can fluctuate quite a lot. But if you stick at it you WILL see your losses over the course of a month or so. Don't get put off by the seeming illogicality of it!
If you drink, take care with alcohol. Once you start, it can be hard to keep your willpower!
Think ahead when you go out to eat, and look up the syn values on the menu in advance. But be prepared to go a bit over on your syns to enjoy the occasional night out, if that works best for you. One evening off-plan probably won't ruin your week.
Drink lots of water!
Good luck!