Don't warm up butter before you try to spread it. Just cut off thick slabs of the cold butter and lay them side by side on the bread, leaving small gaps inbetween so there's somewhere for the honey to go when you press the two slices of bread together.
Don't recycle anything at all (unless, like me, you find composting a fascinating recreation).
Don't buy socks of only one colour. All my socks are black, but each pair is subtly different from every other pair, and I also have three odd socks. I keep these because one of the paired ones might develop a hole, and if that happened the newly widowed sock might just match one of the old odd socks.
If you have obsessive-compulsive tendencies, do not buy coloured hangers. We have many plastic hangers and I am always tempted to match the hue of the hanger to the hue of the garment. I also feel the need to arrange the hangers in rainbow order. The pink, cream, brown and grey hangers worry me: should pink, for instance, be a subdivision of red, or should the pastel and murky colours be arranged in a separate series? Checked and striped clothes also worry me.
Don't have more than one handbag. All my stuff (and I do mean all) is in a single handbag. I can't always find what I want in its cavernous depths, but I can be sure that it is in there somewhere. If I need the item quickly, I get Paddy to extract it for me, because he searches systematically whereas I just scrabble.
Don't buy lots of household cleaning fluids. All you need is one cleaner (any non-corrosive kind will do), and a dog (to deal with food spills).