Spending Ban?!

I am sad to say, the time has finally come for me to officially embark upon a spending ban. I'm not going crazy and aiming for 100 days or anything like that - I'm just aiming not to spend uneccessarily in the month of March. I'm setting myself a few rules so that I know what is and isn't allowed, and I'm going to try to post a few updates on Just Jess so that you can help to keep me on track!

1. ABSOLUTELY no purchasing of clothes, accessories, makeup, or nail polish. I DO NOT need any of this - there is no chance of me running out during the course of the month. Not even a tiny risk. No matter what I say, do not let me buy any of these things!
2. No purchasing of books (including eBooks!), magazines, or music.
3. No impulse-buying of things for our house.
4. No buying of food at Uni, or whilst travelling to and from Uni. Tea is allowed, but only if I've also taken my Thermos and drunk it all.
5. No chocolate. This is the one that might just kill me.

I am allowed to spend on the following, although sensibly:

1. Gifts (FOR OTHER PEOPLE) - it's Mother's Day on March 10th, and my boyfriend's birthday at the start of April, so I'll have a couple of presents to buy, and that's okay.
2. Essentials such as shampoo, body lotion & cleanser - I'm unlikely to run out of any of these, but should I need to purchase any of them, then I can.
3. Obviously, things like food and groceries are allowed, and I never buy anything extravagant in those categories anyway, so this shouldn't be an issue.

So it's pretty straight-forward - I won't be buying anything I don't need. I'm hoping this will help me get my spending habits back on track and show me how much money I'm throwing away every month. I'll try to keep track of any slip-ups, although I'm hoping there'll be none of those, and the things that have made it hard for me.

Have any of you ever completed a spending ban? Do you have any words of wisdom to share before I get underway with this challenge?

xo