Pronouns (of course)

If I ever figure out pronouns I shall celebrate. In the following phrase "Un gusto conocerte" the "te" goes at the end of "conocer". Similarly in the phrase "levantarme" the personal pronoun is at the end of the verb. Are there some rules about when the pronoun is stuck on the end of the verb as opposed to putting in front, such as "me levantar" or "un gusto te conocer"?

Most often, object pronouns are attached to the end of the infinitive. I don't think they _have_ to be, but usually they _are_.