Radiotherapy is usually a mop up after surgery I gather to remove any tiny bits of cancer surgery may have missed.My tumour was 1.4 cm 2 nodes removed one with microstasis . Radiotherapy was a HAD to for me - 16 rounds but chemo not recommended as believed would not contribute much to reducing risk of recurrence 3 % - they have tools they can punch the data into and assess risk and I assume they have done the same for you. I didn’t find radiotherapy too difficult - a lot of travel as daily zapping , skin damage was manageable with creaming 3 times daily and more if I felt necessary , a bit of enveloping fatigue at the end for a few days..Re creaming you need to do it during treatment and for 3 months after - I used Dermaveen but the ladies on here swear by MooGoo and it does muck up clothes .UV was a problem as we went to Cairns 6 weeks after treatment and I wore a rashie plus avoided lengthy adventures in the sun. Radiotherapy can have longer term side effects - I have had an inverted nipple which scared me as is a sign of bc but had mammogram ultrasound and needle biopsy all clear - was side effect of radiotherapy for me but ALWAYS get checked.I also have had an infection needing lengthy antibiotics and chest pain also checked by ECG and clear. Radiotherapy can have bone impacts causing weakening and fractures.Its not quite been a walk in the park as side effects occurred months later and scared me.I also had LHS bc deep in my chest above the heart. I can’t answer for you however - the best I can do is tell you how it was for me and hopefully the information may alleviate some of your concerns.I also placed my faith in a wonderful oncologist and listened carefully to his guidance.I would ask your oncologist their advice and act on it.