hello and welcome,
since you do not have pain in your first visit while removing pulp tissue which is non-vital,you will not get pain in your following visits too.
in case of root canal treatment
,more chance of getting pain is in first visit,ie,while removing pulp in the canal.
since the tooth is non-vital,in next visit,biomechanical preparation using k-and h-files and cleaning and shaping of canals using saline-sodium hypochlorite solution has to be done.
then after drying the canal using paper points,it has to be obturated with gutta-percha points using sealer by lateral condensation technique.
take complete antibiotics-analgesics course.