When you 'talk through' something you explain in detail how something should be done or discuss something in a way that is sure to be understood. This is a casual informal expression that is commonly used in both social and professional contexts.

1. I had never driven a car before but I was helped by having the instructor sat beside me, talking me through it step-by-step.
2. Things had been difficult between us since we had that big argument, but we recently talked through our issues and now we're friends again.

1. The system is a little complicated, so let me talk you through how it works.
2. At first I wasn't sure whether I really wanted to take that job, but then I talked things through with my wife and decided to go for it.