Each person should be tailoring his investment to his situation, and surely there should be less ability to aggressively invest into bitcoin if you are brand new to investing and brand new to bitcoin, and so if you don't have your shit together, including having some consideration of the 9 individual factors.

And, surely I m not even suggesting that someone needs to know all his/her 9 fatoprs prior to getting started, since one of the most important things in bitcoin is to get started, yet merely because you should get started, does not mean that you should go all in, yet a newbie can consider creating a target of anything like 5% to 25% of his income to go into bitcoin, but yeah, that won't work too well if he had not figured out his discretionary income (in order to not go beyond it) and to perhaps create an emergency fund that is 3-6 month of income/expenses, but I am not even saying that the newbie guy has to create an emergency fund prior to getting into bitcoin, but if he does not have one, then he may want to pace both his entrance into bitcoin and his establishing of his emergency fund, which could cause some delays in terms of getting any kind of decently sized starting bitcoin allocation... but yeah, everyone is responsible for himself, including if he fucks up, he overinvests, and he has to sell at some time that was not in his initial plans, but there still might be ways to recover his situation, even if part of the solution might be to regroup and to sell a bit of BTC, and hopefully at least the portion that is sold is profitable (minimally) even if it might not have been a good idea to sell it,  there are sometimes needs to regroup and reasses and maybe some of that can be done slowly over time (which tends to be my favorite way of doing things), and other times, there may be needs for more extensive and quick measures in order to get things back to a more balanced state of being.