Decoration is a bottomless pit. First, find a cost-effective decoration company and let him help you with the foundation construction. Then there is the color matching. You must buy all the materials yourself. You must compare and compare them. You can't buy whatever you want. Give yourself a budget every time you go shopping. You can surpass it, but not too much. If you want to choose a brand, choose a brand with a lower grade. High-end brands can understand.
But not on impulse.