I find that - paradoxically - it is more freeing for me to make a hard and fast rule than it is to bend on every issue.
For example, I have always admired Angie's wardrobe "one in, one out" rule, without actually following it. This year, I will do more following.
I am also finding it freeing this year not to click on every retail wardrobe item I see that appeals to me. Check my favorite resale sites, see if I have something similar already, give it a cooling-off period and see if I keep going back to it, etc.
How about you, do you chafe against the hard and fast or find it helpful?