In the context of "not overselling" to onboard people, it's also very important to tell people Bitcoin's limitations and how ownership of Bitcoins require total responsibility from the person himself/herself. Lose your keys, then you lose your Bitcoins. ¯\_(ツ)_/¯
People should be ready to take responsibility to own their first coins because if they can't, they shouldn't own Bitcoin OR they should probably start wih a very small amount.
The first education should be on how to secure their wallet's private keys.
Because beginners can buy a lot of Bitcoin with their savings and even become big investors but still lack the security knowledge that must be done.
Many can buy it, but few can keep it safe.
Maybe buying small amounts first like you said would be a good experiment, because while learning how to invest in Bitcoin properly and safely.
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By having complete knowledge and experience about Bitcoin, you can also provide information about Bitcoin to other people, and after the money comes you can make a great investment in Bitcoin.
But never give investment advice to others even if you understand Bitcoin.
Because investment advice will backfire when the advice is wrong and results in other people's losses.
Providing information may be just general knowledge about Bitcoin and what are the benefits and risks.