@claspe - hi there and welcome to the forum. 
hi there and welcome to the forum. 
I had a single left sided mastectomy and sentinel node biopsy on September 23 last year. It was decided that I wasn’t suitable for a reconstruction as my hospital only offered implants and I’d only recently given up smoking and so that there was a risk that the implant would fail. 
Unfortunately, if I wanted a DIEP reconstruction, I would’ve needed to be referred to a different hospital which could’ve delayed my surgery and I really didn’t want to delay it any more than necessary as I had very extensive multifocal DCIS with invasive ductal carcinoma which was HER 2 positive.
My only thoughts were getting rid of the cancer and I just wanted to have the mastectomy over and done with as soon as possible. My surgeon in fairness did try to talk me out of having a mastectomy without an implant, pointing out that I was still young which I found quite flattering as I was 52 at the time 
and that I might regret not having a reconstruction. However, she was also a fantastic surgeon and I left the hospital on the day with not even a drain in place. The only issue that I had was a small seroma which is a collection of fluid which has a small infection in the scar a couple of weeks later but a short course of antibiotics sorted that out. I wasn’t in pain when I came home from the hospital as id had a nerve block injected into the chest wall and I spent the next couple of weeks sleeping on one of those nice V shaped pillows which was an absolute godsend and stopped me from rolling over onto my operated side .
fast forward to now and although I had a few wobbles where I wondered if I’ve made a mistake not having a reconstruction I can honestly say that I’m really happy with my operation scar. I know that sounds absolutely crazy to say it but it’s actually a beautifully neat scar. My surgeon did a fantastic job . I have a smile shaped surgery site but the scar has faded so well , actually if I stood from a distance you would barely spot it now I have a small flap of skin that hangs a bit just under my arm but that’s probably because I was a bit overweight anyway and that’s where they remove the sentinel nodes, Looking directly on. There’s no lumps , there’s no bumps there’s no dog ears or anything. I’m really quite pleased with it , a few months after my surgery I started just rubbing massage oil into the area also just to hope to try and get some sensation back as I have been left with some numbness there which I’ve been told is quite normal and doesn’t impact on my daily life although I do get some strange sharp pains in there from time to time which again I’ve been told is perfectly normal.
My breast apparently weighed 2 1/2 lb so it’s quite sizable
and my prosthetic I was fitted with the January following my surgery and to be honest with you I absolutely love my prosthetic. It looks just like a breast inside my bra and I plucked up the courage to go onto a bra fitters in the summer thinking that I was going to be stuck with some really ugly mastectomy style bras for the rest of my life and she fitted me up with some beautiful underwired lacy black bras which my prosthetic just sits really nicely in And honestly when I tell people I’ve had a mastectomy they’re absolutely gobsmacked because I don’t look ,with my clothes on as if I’ve had one and in fact even when I take my top off with my nice bras on - even the lacy one that’s a bit see-through you wouldn’t really know that that’s a prosthetic.
The only giveaway is the slight lack of the cleavage that I used to have.
All in all I’ve come to terms with my new body now and I don’t grieve my breast in the way that I thought I would because in my eyes it had to go because it was going to kill me. I know it’s personal preference and not everybody wants to be left with just one breast and I’ll be honest enough to say that I would’ve been quite happy to have had the other one removed as well, but obviously this was not going to happen as my surgeon would not do this surgery but I would like to look at getting “tidying up surgery” of my other breast at some point in the future.
I was a 42 double D so I’d quite like to have the right breast just reduced a little bit and maybe you know lifted up a little bit 
Have lots of detailed chats with your surgeon, remember that this is your body and there is nothing wrong with explaining how you would like it to look after this surgery, just because you have cancer doesn’t mean that you have to come out of surgery looking like you’ve been attacked with a tin opener !
It’s really important that the aesthetics of the surgery are something that you’re going to be happy with afterwards, best of luck with your surgery in December🩷
Arty1 