If you are playing blackjack game with a mentality that beating blackjack is not so easy than you are thinking in a wrong way, instead of this beating blackjack is very easy. Only thing which you need to have in this game is patience and practice.
First thing which you need to focus in this game is card count. Card counting is very easy, when dealer is dealing the card you need to have a close look on every dealt card and starts adding and subtracting 1 in your mind. The best point when you can do this, is at the dealing of second card to everyone.
Your betting size and your bankroll plays an important role, size of your betting should be like 1/1000 of your total bankroll. Your bankroll defines the amount of money which you can loose in without turning crazy. 32 betting units of cash you should have in each session in your hand. With the continuous adjustment in your betting units, you will never go beyond your betting limits, and with the same process you will increase your bankroll in the longer run.
Maximum bet of yours should be the 4th times of your betting unit. Avoid to bet more than 1/4 of your money in each session.
Figure out the remaining decks. Make the decision of running count with the remaining decks number, it is called as the true count. For example if you have 2 decks remaining and 8 is your running count, then true count is 4. Further remove 1  from the true count it will give you units of bet remaining for you.