Stripping / cutting weight for comps.

Just wondering peoples habits / tips / methods about cutting weight before a comp. I've always struggled with this, but i think, with me, its having too much water the week before. Possibly diet.

What changes do you make to diet or raining in the weeks leading up?

My next one isn't till feb, but want to fall into the next weight category down (Currently in 73-79kg weighing 77kg).

Cheers guys.