One of lessons I have learnt in trading crypyocurrency is to be dead to your emotion and use numbers and historical chart to your advantage not to your disadvantage. The moment you master your attachment and emotional triggers as regard your trade, your profit will start to grow until you reach your set goal!
Traders are supposed to treat currencies as tools and not something to get attached to. But this differs on the basis of long term or short/mid term. While coins kept for long term purpose will be there for sometime and one may get too attached to them, those in short or mid term have to dealt with quickly and decisively.
In reality what most newbies end up doing is buying or selling at the wrong time and not just make the mistake of getting attached. This is more true when coming to altcoins. Every trader should know that any altcoin needs to be traded quickly as soon as profits are seen and as soon as they break even on ROI.