A good way to not mess up your trade is to use OCO (Stoploss) functions on the exchange; after you have purchased and made your investment; you can set up the oco to limit your losses options, so that instead of missing out entirely on your capital, you atleast have little losses and can move on to other trades . ALSO, you cannot panic while trading crypto currency token. so work on your emotions and trading psychology.
Even though I already know about the existence of OCO (Stoploss) on several exchanges, the solution you provide is clearly very good for everyone who trades using emotion, especially for beginner traders who have just jumped into several crypto exchanges.