It is a relatively simple procedure that is very quick and can be done usually in a Radiation Oncology Department. The Radiation Oncologist should go over the side effects that he should experience during the treatments. Any side effects your doctor explains generally don't start happening for a few weeks into the treatments. Radiation is cumualitive. That's why radiation is given during a course of 4-6 weeks typically instead of just a few treatments.
Radiation relies on the cell cycle.
Radiation is only given 5 days a week because the cells need a few days off to recover. Radiation not only kills bad cells, but it also kills good cells too. The hopes are that the bad cells won't re-generate, but the good cells will with time. The doctor can prescribe medicines and creams to help with the side effects of the treatment. Don't be afraid to ask any questions, even if you feel like you're pestering someone.