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All I can say is that everyone makes investment according to their financial muscles, that's just the simple truth. Most multinationals companies we see and hear of today started very small, if you read through their stories you will really understand that you don't have to be fully comfortable before making investments. I agree with you when said that investment is all about mindset. Some who is earning little salary today and doesn't plan on investing so that he will have a better opportunity tomorrow will continue to be poor for life. If someone is earning $50 as monthly salary, the person should at least invest $5. If $45 cannot take care of you as someone earning $50 as salary, then the entire $50 can't still take care of you. Investment is sacrifice, and it's because of the investments we have made today that's going to be our hope in the future. No matter what level we are financially we should never forsake investing.
Depending on what you are referring to, mindset might play a role. For instance, when volatility kicks in as it always did for Bitcoin and weak hands feel like selling is the right thing to do when in fact the answer to volatility is to stick to the plan and accumulate no matter what. The
no matter what is the mindset thing. People often want to play the market. I'll be straight out honest, I tried to do that in the distant past and thought if it drops and I believe it drops (although I didn't have any good reason to back it up), I sell and then buy back later for cheaper. I can tell you it is at best a coin flip and it is probably not a coin flip because psychology doesn't stop to kick in. You get the timing wrong getting off the train and you get the timing wrong getting on the train.
Buy the dip and HODL is only half of the equation. Or maybe it is 150% of the equation, but we need 100% to get it right. Going too hard, going too low, all bad. The solution is: Buy and HODL.
When you make the decision to buy, it hopefully means you got cash at your disposal that you don't need anytime soon (or never in a best case scenario) and you are happy about what you get for it because what you get is the thing you think will appreciate in value.
Buy the dip, buy the high, buy the all the way down, buy all the way up, and stop when you think you are loaded as per your own desire/need/requirement to add to your portfolio (whatever that consists of).