Its different for everyone. Everything you can do in a dream is based on your expectations. If you believe you can do something, you can do it. People write up techniques and tutorials as suggestions and examples of what has worked for them, but it always comes down to your confidence and belief.

There are not really any hard and fast rules to how the dream world works. You sort of create your own as you go along. Keep that in mind, however, as you read through other people's experiences. Sometimes, you will hear someone say it is impossible to do something in a dream. If you believe them, you will be limited by that belief.