Where can i learn about what it's like to be a nun?

a nunnery/convent, you can live with them on a probationary period, as a novice without taking full ordination. that’s the best way, when you say nun i assume you mean Christian. Or maybe you could just do a retreat for a few weeks, i’m not sure what all the options are.

A Nun’s Life

In this house of Brede by Rumer Godden

The Secret Life of Nuns (16th C novel)

The Journey of One Buddhist Nun: Even Against the Wind (Thai Nun’s story of dealing with anti-female culture)

My Life Remembered: Nun, Priest, Feminist (probably most helpful to you)

Nuns Having Fun

The Buried Life: A Nun’s Journey (published in 1971. Story of a woman who eventually left the very strict community she had lived in for so long)

Unveiled: The Hidden Lives of Nuns (A description of a wide variety of contemporary Catholic Nuns’ lives)

anunslife.org
wisegeek.com
learnalittle.com
A nun is a religious female who lives a contemplative cloistered life of prayer and meditation, while a sister, in Christian denominations, lives an active vocation of prayer and service, often to the needy, sick, poor, and uneducated.

It takes a lot of discipline to become a Nunja