Perform Initial Application and Test Functionality

What happens here

With the tool prepared, begin the initial application by pressing the brush head against the surface and manually squeezing the reservoir to feed liquid. The man is seen applying paint to a white house siding, moving the brush along the vertical planks. He notes that this continuous manual pumping can be tiring, stating, 'It's taking a while. My wrist is getting tired,' suggesting it requires sustained effort.

Goal: Begin applying paint and assess the tool's performance and ease of use.