1, Read, read, read.
2. Sample it up.
Investing in expensive items can sometimes be well worth the money. I often find buying one good item is better than wasting money on 3 or 4. Think about staples in your routine, that you're guaranteed to use everyday, and purchase ONE high end replacement. Be it a face wash, foundation, blusher or lipgloss, make sure it's not outlandish (gold eyeliner may seem like a good idea at the time) and that you're going to make good use of it. A boots haul may be fun every now and again, but I often find I appreciate items more when they come solo.
4. Look for dupes.
So there are my tips. Do you have any great pointers for starting a beauty habit on a budget?