The basic mechanics of trade execution and the level of knowledge of professional market participants essentially guarantee that your "strategy" will leave you with empty pockets. In trading, the sort of bet you want to make is called "trading a binary event" - statistically, a long-term losing proposition for even the best-informed traders. If you don't know exactly what you're doing, the loss term becomes much shorter.
First, nobody is going to simply dump a huge order into the market for everyone to see, for exactly the reason that you describe. Why in the world would they raise the price on themselves when they want to buy, or drive the market down when they want to sell? Orders are split into small pieces and sent - possibly to a variety of exchanges via arbitrarily-delayed routing - through routing brokers in order to avoid giving away that kind of information.
Second, and much more important: neither you nor anyone outside that institution has any idea which side they're going to take today. They can, and do, buy and hold for years - especially in highly-liquid, high-volume instruments - and sell when the price reaches the level they want. They also accumulate slowly and essentially unnoticeably. You cannot and will not front-run the big boys; they spend very large amounts of money to ensure that you can't.
The absolutely solid, incontrovertible fact of the market (and this offends technical traders to the core of their souls) is that no one knows what it's going to do. As an active options trader, being able to predict even a penny's worth of movement in a specific direction at a specific time would be worth unlimited amounts of money to me. And you want to do this in stock? Against institutions, which hire the best financial and statistical brains on the planet?
I suggest you re-think the premise behind your bet - and moreover, that you re-think the assumptions behind the desire to make this kind of bets. If you indulge it, it will leave you broke and keep you so.