كيفية الحصول على ثيتا في حد ذاته؟

Could you please explain, in simple terms, the process of obtaining theta independently? I'm trying to understand the steps involved in this endeavor. Could you outline the key factors to consider when attempting to acquire theta? Additionally, would you mind discussing any potential challenges or obstacles one might encounter in the process? I'm interested in understanding both the theoretical and practical aspects of this matter. Thank you for your assistance in clarifying this topic.