You'll make it, just hang in there!
The very best way to lose fast and consistantly is to go 100% level one and no cheats of any kind. If you can do that, DO IT!!! I can't do it all the time and without sweets I'd never make it at all.
Start with just the snacks, not the sweets. Are you snacking between meals as Suzanne suggests? That should help you feel full so you don't want to cheat so much and so you never feel deprived. If you have to have sweets then make them level one or almost level one and keep them to your breaks.
Some people can't keep any kind of sweets around or they pig too much, but if I don't have some legal(ish) ones I know I'd never stay on the plan. So I include plenty of sweets and legal snacks in my diet every day, and I keep some with me when I'm away from home for any length of time. (I work from home) The hardest thing is when you're sitting around working or watching TV etc. So no matter where I am I try to take "active" breaks where I go outside and go for a walk, or do something in the yard if I'm home. Anything to disrupt that "sit and munch" pattern. And I try to designate snack times equally spaced between meals, as Suzanne suggests, rather than grazing all the time. There WILL be graze days though, no matter how you try. Just graze as sensibly as you can and get back on track again the next day.
There are lost of good, legal munchies to have. Do you like Pork rinds? If so they're great by themselves and also you can make cinnamon coated pork rind snacks etc. I like things like salami or pepperoni, better still rolled up around a bit of cheese or a piece of pickle. An apple is a great snack and quite filling. Baked "cheese crackers," which are just a slice of any kind of cheese nuked for a couple of minutes until it's lacy and crunchy, are a yummy nibble too. Or having a little cup of legal dressing and losts of finger veggies to dip in it is good. If you are out of control at work and going to cheat, see if you can find nuts instead of candy. They are "bad combo" foods, but much better for you than sugar and are quite low carb. They're not nearly so likely to make you crave, either.
For sweets make a few of the legal ones in the SS books and rotate them. Take a little dish of one of them with you to work for your breaks so you don't feel cheated when others are eating candy and other funky snacks. SF Jell-O squares are good, or even mix them with cream cheese and cream (I found a yummy recipe for that) for a three layered pro/fats version that's a little more filling. I like the new Russell Stover chocolate creams which you can order of the RS site, because they are really small and it's easy to put one or two in your purse or in your lunch and curb a sugar binge. They're almost level one though, because of the chocolate, and I had some trouble with them at home because I kept going back for one more and one more, despite the bad Maltitol effects...
and last of all, I often find that having a caffeine free, diet soda will satisfy my snacking urges and help me make through to the next real meal. Much better to have one more SF soda than you intended than a bag of candy!
The trick for me is not to have "just one" truly funky thing. It starts the cravings for me and takes days to get them back under control. At least when I overdo on legal or almost legal treats the results are not nearly so disasterous. I stall or go up a pound or two, but I don't find myself packing on the pounds alarmingly and I can get back on track much faster than if I cheat with truly bad stuff.
Hopefully other people will have different angles on the same problem so you can find a plan that works well for you. But DO stick with this, it's such a great way to eat and you really do have so many more options than on most other WOEs. Remember it's not about this week or this month, it's for the long haul, right?
You can DO this!
You can! You can! You can! You can!