Yes trading is difficult. especially when the altcoins fall as you can get caught up in it. The value of your bitcoins may have fallen if you did not sell it immediately so it should be yours. And as you learn it you should always keep in touch with the news so that when there are good or bad news you can immediately answer it
Those are parts of the difficulties you have to face in trading. However, if you know what you are doing, you should always know the quickest and best time to always get out from a trade so as not to make a huge mistake hoping for it to get back past up. You can be lucky it goes deeper and you can buy then and profit back from the rise.
I only know one thing and that is Trading is an art and not everyone is an artist. It is no doubt a very tough job to learn and excel; in the world of trading. You actually need to burn your midnight oil and you actually need to put in lot of efforts to learn things well. Trading is a multi-dimensional thing and for becoming an expert in trading, you need to learn so many different things.