How can you tell if you hit puberty? what are the telltale signs?

A process, not event: Puberty is series of changes, not just a stage that you "hit". It is a process that occurs over several years. Girls will usually start with breast development. Later, the onset of periods and the growth of pubic and underarm hair. Boys will experience an increase in size if their penis and testicles, and a change in skin of the scrotum, and they, too will start growing body hair.

The starting gate: If you're looking for a tipoff the beginning of this long process it might be hard in some.For girls it's pretty easy as one or both nipples begin to grow out.In boys, the first sign is the enlargement of the testicles.You change from small green olive to giant ripe olive. A few pubic & underarm hair & odor can & do often show up early, a year or so before the real stuff begins.