Educating clients on tax planning

Do you guys have any tips for educating clients on tax planning? I have met so many people that I completely lose (conversation wise), when I start talking about tax planning.

It doesn’t even have to be something complex. It could be as simple as, “I’ve notice you are significantly under withholding on your W2. You may want to speak to your HR department and withhold more.” This often results in a lot of blank stares.

Also how do you manage questions? People ask me so many questions about various scenarios, which then causes me to take way too much time providing a thoughtful and researched answer.