Teacher or self-taught
It is theoretically possible to learn meditation from a book. However most
people who teach and practice meditation agree that a teacher can be an
invaluable aid in learning a meditation technique and making sure it is
practiced correctly. The beginner will usually have several questions which
a teacher will be able to answer. Also, learning with a group of people, eg
a meditation class, allows you to experience the benefit of meditating with a
group of people. Most people find that they have some of their best
meditations while meditating in a group, because there is a collective
energy and focus present.
Various individuals and groups teach meditation. Some charge and some
do not. Many different techniques are taught, some more spiritual in nature
and others mainly concerned with stress-reduction and gaining a little
peace of mind. As always, the important thing is finding what works for you.