A reflexive pronoun can go at the end of an infinitive or before a conjugated verb. The meaning does not change. Yo no quiero afeitarme hoy. Yo no me quiero afeitar hoy. I don't want to shave today.
Use the preposition para before an infinitive to explain your purpose for doing somthing. Verbs after prepositions and prepositional phrases such as para, antes de and después de are in the infinitive.
Tengo que levantarme temprano para leventar pesas con Ana en el gimnasio.