My top tips are to plan and prepare.
Write everything down even if you blow your syns big time but don't let it guilt you into quitting, just get back on plan as soon as you can. We're all human so will have days when all the best laid plans go out the window.
Stay to class if you can, that's where you'll get support and also where you can support others. Attend class even if you think or know you'll have a weight gain because it will help you to draw a line under the gain and get you back on track without feeling guilty and in a positive frame of mind for the new week.
Your consultant has a private facebook page for her members, it's where you'll get support between classes.
I personally don't like the SW diary pages that are given out in class, I used to just do my own with meals broken down into breakfast, lunch, dinner, free food snacks, syns and healthy extras. However I now use the SW online food and exercise diary that's under the weightloss planner. It's easy to use.
I'm on the social team and the members that have the biggest and consistent losses are those that use all their syns.
Try and have a few store cupboard ingredients as a standby for when you need something quick. Also worth freezing the occasional leftover meal that can go straight into the oven or microwave.
One thing I've found very handy for standbys and for when I'm short on time is to have bags of frozen veg such as sliced peppers, mushrooms, onions that I can just cook from frozen to make omelettes, add to dishes etc. or cauliflower or broccoli rice to serve with dishes instead of rice.