Memorize the monologue by dividing it into manageable sections and repeating each section until you no longer need to refer to the text. Memorizing the monologue ensures that you are not left struggling to remember words, which will impede effective portrayal of emotion.
Translate any old-style monologues into modern English. Recite the translated text until you feel you have gained a comprehensive understanding of what the piece is expressing.
Study carefully the "scansion" of the writing, which is the stressed beats of the words that determine the rhythm, pace and tension of the piece. Come to grips with the rhythm and focus on identifying which words require emphasis and when to take breaths.
Rehearse the monologue until it fits like a glove. Because acting is so closely related to reaction, it is essential not to rehearse alone, whenever possible. Focus not only on acting but also on reacting to the reactions of your rehearsal partner.
Avoid eye contact with the audience by selecting a focal point somewhere just above their heads.
The audience is not there to perform, the actor is. However, because a lot of emotion can be portrayed by facial expression, always ensure that your face is appropriately visible.