Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

How to execute a large stock purchase, relative to the order book?
I normally just do a buy limit at the price I want to buy it at. Then it executes when it's that price or lower, but there's still a chance you might purchase some shares at a larger price. But since we're small fry and using brokerages, there's not much we can do about it.