A good HODLer can resist any temptation to make (small) profits prematurely and a good HODLer keeps his Bitcoin.
Bitcoin is revolutionary, and if we understand that feature of Bitcoin, then we would know why we shouldn't sell because of temptation. Selling may offer you instant profit, but hodling will provide you with long term profit.
A good HODLer stays cool even in case of losses. Best we can do is to move our valuable Bitcoin somewhere where it has a high resistance of being sold.
it depends on their emotional and self control, looking at chart patterns are important too, but without solid discipline most persons will panic sell when in loss.
And we shouldn't store it on file-sharing networks anyways and also not on centralized exchanges because we don't have our private key on such platforms (not your key, not your coins).
Yes, this is one of the best precautionary measure to practice as Bitcoin hodler. And as well ensure we are buying it from a legitimate exchange. I've heard many stories of people buying BTC and it ends up being from some untrusted broker which is really just one of those scammers trap that will never let you withdraw the funds.
If it's not too complicated I also suggest after we purchases the BTC we should withdraw it to a private wallet off the exchange to ensure maximum safety in the event the CEX goes insolvent, or trading is halted due to violation of various laws as per the local law enforcement. Its best we withdraw it, perhaps any one is afraid of withdrawing then they should learn it.