There are two options: 1.) If you have a lot of money, money is not a problem to you at all, then you plan on buying bitcoin with all of it, I guess it is not risky at all, because you could make profits in a very short period of time when bitcoin PUMPS after you bought some on a DUMP state. 2.) If you want to risk all of your money, because you wanted to earn that bad, you have to make a tough decision, you could risk all of your money, and if you have changed your mind after you bought bitcoin with all of your money, then you could just simply sell it and you have your money back, with your profits maybe.
In my conclusion, bitcoin is not risky even there are some people thinking it that way, but it is really not. It is a good way on how you could earn money on a very safe and easy way.