You answered yourself when open the thread! The right amount for investing is the one you feel comfortable. The biggest mistake in trading is when you emotionally attached to a trade because than you get mentally drained and thats the good path to mistakes. The good thing about cryptoworld is that everything goes up  so sometimes even mistakes pay out. However, chill and trade if you got time otherwise just buy and hold and dont be stressed up about need for profit. Greed is a killer!