I just finished 7 weeks of rad. As Tavish said, it is a breeze compared to chemo. I had no fatigue, but I did have some burning. My rad onc does this intentionally. Towards the end it was uncomfortable, not painful. I used something she recommended. It is expensive -- Glucan Cream and I have now started on the Glucan Pro.I am already peeling as in a bad sunburn. I do not know about scarring, but they said my skin was "great". With that burn, I would hate to see bad skin.
Be sure to use the products your onc recommends and try not to worry. As Tavish Said, everyone is different.