Hi,
In the book, by dale carnegie, called "stop worrying and start living" he describes a system he uses to help him make some decisions.
Some decisions can have a monetary cost applied to them. E.g. Should I walk through the rain or get a taxi is an example he used.
If the cost of the difference is less than say $5 then he will get the taxi.
He says the decision is not worth more than $5 so he didn't think about saving the $5 and just spends it.
You can put your own prices on things, and I've found it useful for simplifying some decisions.
Unfortunately the monetary value is overused by me. My psychologist encourages me to think not of the monetary cost, but the mental cost in choosing between two options.
I find it very difficult to do, and often spend dozens of hours researching options, as I would rather have nothing and do without, rather than buying the 2nd best option.
I recognise it is a tremendous waste of mental energy, but it is difficult for me to consider mental energy.
E.g. I have been regularly trying to decide for 29 years whether or not to use a lense cloth that I bought in 1988, to clean my spectacles, and it is still never been out of the packet. (I think bit would get dirty quickly and scratch my lenses) whereas my optician says the paper towels I use will scratch it more.
My psychologist also informed me that The entymology (history) of the word "decision" , comes from roman or Greek, and derives from "death of other choices", and so by making a decision, we may be scared / not wanting to kill other choices.
His observation was made when I told him I had bought a very small fire safe to protect some of my documents or photographs in case my house went on fire.
I had it for more than 17 years without putting anything in it. I had many things and the safe would protect only a small portion of them. I could not decide what would be the best items to put in it, so I left it empty and useless .
Best of luck