do not target what you will get in crypto currency because I'm so sure you'll lose it if doing that, doing the job and still doing the trading is a good thing because if you had a loss then you can cover it with what you get in your job and vice versa
Job and trading both are good ideas. If you can manage to job as well as trade in the same time, you are better off. Because a job will give you a specific amount of income you need to meet your needs, you could treat the income from trading as a side income and not relying on it. This will enable you to trade and hold Bitcoin for long. A day will come when you will have your coins sold at a price much higher than the initial prices.