Of course, investing in Bitcoin can be easy, As you mentioned, there are huge challenges to sustaining investments over the long term, Maybe you don't yet have a secure source of income, Which is why it still seems very challenging for to hold on to your Bitcoin investment for a long time. If the way from where you are earning money is certain, that is, if someone's method of earning money is certain, then he will be able to easily solve any problem while investing. Before investing, many people may think that the most important thing to do to sustain long-term investments is to build an emergency fund. Actually, this is not the case because a temporary emergency fund helps us to continue investing without any fear or any pressure.
You also said the right thing about how to invest because if someone still has fear to invest in Bitcoin in the long term, of course he will not be easy to do it even though he has a regular income every month and can be enough to be used for the investment. So besides having to have a little fund for emergency needs, you also don't have to be afraid to do it because people who have the courage to invest in Bitcoin for the long term also have quite an extraordinary amount of assets at this time. So fear also needs to be eliminated before someone starts investing with a fairly wise goal, namely for the long term.
If they pay to much attention on the negative news spreading and always care about the prices also the volatile movement of the market then expect that they get fear to invest on Bitcoin especially if they have less to no knowledge on this coin.
But if they exert some effort to know the basic and eager to learn about Bitcoin then provably that starting up would never be a big problem with them and they just need to do the first action then everything according to what they want to happen would provably came especially if they are eager to hit more bitcoins for long term purposes.
Its usual scenarios we see some doubters regret their decision not to buy bitcoin before. So to avoid that we better take good action since we know Bitcoin has good future coming ahead and its good if we save some then trying to get profits if price would shoot up in future.