Earlier quoted context omitted.
I would advise to not start on your own and seek a teacher. A book is not a great medium to learn it.
While self taught can work for some people, for most it does not work out. A big thing on self meditation is that it means you do not have a mediator/moderator. Possibility of ending up on the path to 'Zen-sickness' https://tricycle.org/magazine/meditation-sickness/
People will try to "be calm", "be zen", they will attempt to "empty their mind". They will look for something special. They will not understand the implications of frustration, impatience, discomfort...
It's very hard by yourself because you bring with you a lot of ideas from a world that doesn't meditate, but certainly has a lot of things they want to claim about meditation no matter how little experience with it they have.
And you won't know when you got in a direction that will not work for you