During a lung cancer screening, typically using a low-dose CT scan, you can expect a quick and painless process. You'll be asked to lie on a table that slides into the CT machine. The scan takes only a few minutes, and you may be asked to hold your breath briefly while images are taken. It's essential to discuss any risk factors, such as smoking history, with your GP before the screening. If anything concerning is found, your doctor will guide you on the next steps. Remember, early detection can significantly improve treatment outcomes.