I am surely more inclined towards suggesting that people do not delay in getting started in terms of investing into bitcoin, but they still need to be spending some times making sure that they do not overdo their investment and they are working on learning as they go, which may or may not be a big ask.. but any investment does require at least some basic understandings regarding personal finance management in order to understand that investment monies is coming from discretionary income rather than being money that might be needed for living and/or emergency expenses, so if anyone new to bitcoin has not gone through some preliminary steps in terms of managing their own finances, then yeah they will likely end up getting themselves into trouble at some point not being able to hold through hight BTC price volatility periods.. which could be either selling at a loss or even selling too much too soon during periods that the BTC price is volatile to the upside.
In support of your comment I will say, it's not advisable for a person to jump into holding without having enough knowledge to guide him/her during the holding journey. Because, such person is prone to letting their emotions decide for them and that is as good as giving a one year old child a knife to play with as a toy, the outcome will always be disastrous. When emotion is made the decision making element of an investor instead of knowledge, the losses are incomparable.
Before one starts holding, it is crucial to have a broad understanding on the asset he or she intends to hold, if buying isn't the problem then I suggest knowledge before holding.