It depends on many things!
For TRADING (buying!) you have to be good at it. It is not a game to just buy and be sure you make profit. You need to know when to buy, and when to sell and what. The risk is high but the profit can also be very high if your timing is good enough. And a decent amount of profit requires a decent amount of investment.

For MINING is not easy either. It is not like you can click a button and earn money from what you mine.
first thing you will notice about mining that will eat through your profit is the electricity cost. If you don't have a cheap electricity then forget about mining.
There are other issues too. such as the initial investment. you have to buy some good equipment. whether it is ASIC miners, or 1 or couple of good GPUs it will cost you a large amount of money.
Then it is the problem with cooling and the sound which is the smallest issues.
But the other big issue is the fluctuations in price. the highly volatile nature of altcoins and the fact that they are pump and dumps can give you a huge profit or lead to a big loss.