I've acquired a lot of makeup in the last month, so I have a ton to experiment with - I didn't really have a collection before, and suddenly went nuts. I realized that I have to stop myself, so I came up with a plan, and it'll help me curb spending in other areas, too.
Inspired by an article about a "buy nothing year,"* I'm designating 3 categories for every 3-month period that I can't spend on. (I've found that drastically limiting all spending for significant periods is too hard, and taking out just 1 category for 1 month encourages me to overspend during the surrounding time.) So, to start: during Oct/Nov/Dec I'm not spending money on makeup, books, or alcohol, because those have all been significant holes in my budget lately. (Jan/Feb/Mar will be clothes, travel, and dining out, and I haven't yet decided what will come after that.)
How to cut down on FOMO and feel okay with not buying makeup for a while? I didn't want to unsubscribe from all the newsletters; instead, I created filters for all of them so that they skip my Gmail inbox and are automatically archived to a "Shopping/Makeup" label. That way I can see them all at a glance if I need to, but they won't pop up on a daily basis. Traditionally when I've created filters they're very effective and I often forget to check those folders.
As I go through my experimentation with everything I've just acquired, I'll start a list if I think of something I could really use, but wait til January to buy it. At that point, I'll only buy things if they've been on the list at least a month...it's not like I'm in danger of running out of anything. I'm switching my Bare Escentuals sale day to January to give me something to look forward to, also. I haven't decided whether I'll still allow nail/skin/haircare purchases, but I plan to start making some of my own hair and skincare items so I'll allow ingredients for sure. I think I'm fairly set for nails but may allow a few purchases.
The holiday collection that I'll probably have the most trouble resisting is Stila - I'm still kicking myself for missing out on it last year! - but I'll let people know if there's something I really want as a gift.
*
http://www.forbes.com/sites/laurashin/2014/08/20/the-buy-nothing-year-how-two-roommates-saved-more-than-55000/