For new investors, it is safe to start with small amounts and gradually move forward with the DCA method, but you need to be careful whether there is any left after deducting the necessary expenses. If you do not manage your cash flow, even small amounts of money can be lost. It is better to make small transactions at first until you gain sufficient knowledge about the exchange, wallet and Bitcoin system. If someone wants to buy, say $10 per week, then he first needs to know how much money he has on hand after his expenses. It is not necessary to know everything before starting to invest, but it is wise to have a basic idea.
Of course it is important to have basic idea before starting investment because without basic idea one can never invest properly. There are many people who are interested in investing but they don't know the right rules of investing due to which they can't invest properly and keep it for a long time. But I would like to say that one should invest the amount of money that can afford to lose money and should not invest any money especially for urgent needs. There are many people who invest money in bitcoins for urgent needs and when the need comes, they don't end their needs until they sell these bitcoins. That's why I say every investor should not invest emergency money in Bitcoin.