One,,,,,,,,,never be so arrogant that you are sure what a stock or the market will do.
Two,,,,,, Reference number one above, when you want to buy a stock (or the market), only buy half of what you originally wanted to buy, and assume it might go lower. If it does, you can buy the other half. If it doesn’t go lower, just be glad you bought the half you bought!
The same logic should be used the other way,,,,,,if you think you should sell a stock,,,,,sell half.
Like income averaging, eh?