You're not assured of getting an instant profit always. If you're a newbie you have to be extremely careful with this strategy. FUDs or bad news can easily cause a dip and you may not be patient enough to wait for the next rise. It's better to be a patient trader.
Instant profit is possible from trading and specially from day trading, but it is not 100% sure, it require a lot of study, experience and trading skill and also a good luck, if you have all these abilities then no doubt that you can make a good and instant profit from trading.