I agree with you, of course, planning and readiness are indeed necessary when going to invest in btc because it is true that without planning and readiness it will certainly be difficult for anyone to invest in btc because it is like many who postpone investing in btc who ultimately do not get greater benefits from investing in btc. investing in btc is really not complicated as long as we have discretionary income then of course it is true that we will easily live with it.
But certainly if we invest in btc for the long term, of course we also have to be strong to hold because there are a lot of people who invest in btc but they forget about their long-term investment intentions because they are tempted by small profits and finally they sell their btc which ends up not being much and maximum when they get profit because they don't hold btc for long. I'm sure there are a lot of people who experience that, for example like people who buy btc at $20k and sell it at $30k. so the point is that we really have to be strong to resist temptation and must be strong to hold btc for the long term.
You are right in the aspect of planning, because their is a saying that, he who fails to plan, plans to fail, so planning is very much important in Bitcoin investment.
Then talking about the bold words which i disagree on, you don't have to be strong for you to be able to hold your Bitcoin successfully, what you just need first of all is the will and trust in Bitcoin to hold for a longer duration like 10 to 20 years or more, the next thing you do after then is to put down measures that will secure your investment from you tempering with it in the future, something like emergency and reserve funds that stands as a shield and a leverage to combat any unforeseen real life emergencies that may have warranted you to temper with your holdings, so you don't have to be strong like Mike Tyson or at heart before you can be able to invest in Bitcoin and hold successfully, what is required is the will first then putting down measures that protects your investment, like having an emergency and reserve funds in place.