I think I had 20 sessions plus a booster (4 weeks) and finished treatment 6 years ago this week! ....
I had a tiny bit of skin breakdown in the final few days & was recommended to use BOZ (Boric Acid, Olive Oil & Zinc) - Nursing mums use it if their skin/nipples crack .... Up til then I'd used Calendula, Aloe Vera, and Renu 28 by ASEA (as given me by a nursing friend who'd had BC.)
I'd also been given the 'clinical trial option' in 2018 of NOT having Rads - but I preferred to have Rads & mop up any 'randoms' ....
I also had my treatment PRONE (lying face down instead of face up) - and I see there is a trial on just now as to which is 'better' at the Olivia Newton-John Cancer Wellness and Research Centre .
https://www.breastcancertrials.org.au/prone-vs-supine-treatment-position-during-radiation/Tho it depends on the size of your boobs AND where your cancer was removed, I guess. Mine was immediately behind the nipple, so lying 'prone' had it exposed nicely for the Rads machine. (I've always been a 34 but not wearing bras for 50 years made them 'droop' a bit, I guess) - so the Rad Onc thought my treatment could be done 'boobs down'! It also means that rays don't go into your chest cavity as much as 'boobs up'.
Ask your Rad Onc if you might qualify for 'boobs down' ;)
(My surgeon was amazed at how 'natural' my boobs felt after the Rads, as sometimes there can be some 'firm bits' within the breast tissue after Rads.)