During positive counts, the house is still favored to win more hands than the player. Therefore, you will need to get naturals, successful double downs and successful splits in order to win even in positive counts where YOU the player have the advantage. If you don't get those naturals, double downs, and splits (and then win them in the case of the latter two), you may lose big time, because you are betting your maximum bets. I say "may" because you may win all or most of your hands in spite of the odds being against your doing so.
Therefore, even when you only wong in at positive counts, you must be careful not to over-bet your bankroll. Counting is still gambling. Keep your risk of ruin low. Make sure your bankroll can weather the storms. Then, in all probability, you will win in the long term.
No one said it was going to be easy. If someone did, they misspoke.