Well just a few days ago, I created a list on a program on my computer and have typed up everything I've bought , the price and where I got it from that isnt a necessity (even random t-shirts, jeans etc. because i'm all good in that nature). And at the end of the month, I added up what I've spent on the non necessary items. In Jan. I did extremely well keeping it under $40...but Feb...not a good month for me, lol, but I dont think its as bad I as used to be. So doing this helps to me to get an idea about how much I spend on non necessary items (mostly makeup) and then I can cut down on there from items that I actually use or even items I can possibly dupe or buy from here or ebay etc. I also have a "wishlist" where I jot down all the items I want to at least take a look at or buy. Oh and I've recently began keeping my reciepts in a MAC bag also, lmao. I always wind up exchanging for some reason or having to return something because it broke me out or blah, so I HAVE to keep my reciepts!