If we say "one" then it becomes a very easy question. Yes "one" can do it, but who? I can't tell you to pursue this as a business idea and start being a full-time crypto trader because you could be an amazing one or you could be a horrible one, how would I know? I have tried it before, studied a lot, and learned as much as I can and did trading for a year, and I found out that long term holding was always better for me and easier way of making money.
This is why I do not think that we should be focusing that much on trading, it is just not worth it for me. But I also know people who made tons of profit from it as well and living a great life, doesn't mean one is right and the other is wrong.
You wouldnt know unless you try and that the key for you to answer up your own question whether it would turn out to be easy or very tough which is almost close to impossible.
We can do make trades but due to unpredictability of the market then it would really be that hard to be done but actually there are people who do able to make trading as their living.
Although these are people who do have some experience and that have skills which you could really able to rely on but not all would able to attain it.
Some might be thinking that it is really easy to attain these stuffs but its not imho.