Years ago, I read an article that claimed cutting out sugar was extremely easy to do. The argument being that unlike (for example) giving up smoking or snacking, it is a positive rather than a negative act. That is to say that each time you have a cup of tea or coffee without sugar, you are reinforcing the process.
At the end of the day you can say "I had 6 coffees without sugar", whereas saying "I didn't eat 6 sweets today" is meaningless.
I decided to test it (not because I wanted to give up, but purely out of curiosity) and sure enough, it took about 3 days for me to completely lose the desire for sugar in my drinks. On the other hand, I've spent (literally) thousands of pounds over the years on trying to stop smoking, and failed miserably.
If you want to cut out sugar, just cut it out - you'll be surprised how easy it is.