Don’t sweat if you can’t do it first try.
OK, how do you treat an over-exhuberant child? You can’t strap them to a chair and ask them to cool down, right? Similarly, a mind that has a habit of doing its own thing, and lots of it, can’t be tied down and asked to meditate at once. A bit of preparation and strategy is required.
So let's do a (quick and rough) analogy between the two so you can picture the different steps, keeping in mind that preparation is the key here.
For a hyperactive child: First, you need to bring a bit of peace and order in the house by having a regular schedule/routine for everyone. Do this in an incremental, relaxed way.
For a hyperactive mind: First, you need to lead an orderly life with moderation in most things. Be firm but give it time to adjust.
Child: Give them wholesome food and avoid pre-packaged food laden with sugar.
Mind: Give it wholesome thoughts/projects to think about and starve it of those that may be emotionally destructive.
Child: Give them plenty of structured physical activities e.g. team sports and start with the ones they like.
Mind: Make it work hard but only on tasks/subjects that YOU have chosen. Start with the ones your mind likes thinking about.
Child: Push them to their limit so they learn to focus their energy and become single-minded. But have no expectation whatsoever.
Mind: Push it to the limit of its thinking process by being exhaustive, focusing on underlying causes rather than phenomena. But don’t set a goal.
Child: Once they have focus, make the activities less physical and more mental but always well-structured. Try solitary activities.
Mind: Once it can concentrate, switch subjects from external objects to internal ones. This is where meditation really starts.
Child: Once comfortable, give them the freedom to decide what they want to do and how they want to structure it.
Mind: Once well mastered, switch from meditation with seeds to seedless meditation (this is IMHO mistakenly called “empty mind” and not something to be attempted right at the start).
In Zen literature the mind is pictured as a wandering buffalo that needs to be found, brought home and tamed before it's set free and let go.
Hope you get some inspiration from the above.