Small steps.
Useful skills.

1. Start with the device or app you use most. Notice which text is difficult to read.
2. Look in its settings for text size, display, or accessibility. The names vary by device.
3. Increase the text size a little, then return to your usual screen to see how it feels.
4. Adjust brightness to a comfortable level. More brightness is not always easier on your eyes.
5. If you would like help, show John the screen you use most during your next visit.

Take your time. A comfortable screen is the goal.

1. Write down the two or three things you would most like help with.
2. Charge the devices you want to use and have their charging cables nearby.
3. If something goes wrong, make a note of what you were doing and the message you saw.
4. Know how to sign in to your own accounts. Keep passwords private and enter them yourself when needed.
5. Have a notebook ready if you would like to keep reminders from your visit.

Let John know your location and discuss the rate before you arrange a visit.

1. Notice whether the problem affects one device or several.
2. Make a note of where in your home it happens most often.
3. Write down when it started and whether anything changed around that time.
4. Check whether your device shows it is connected to your usual network. Do not share the network password in a community post.
5. Tell John what you noticed so you can work through the next step together.

You can leave advanced settings alone. These observations are a useful starting point.