I had a bilateral mastectomy (nipple and skin sparing) with the expanders under the chest muscle at the same time. I wasn't able to do anything for a couple of weeks ie no lifting, pushing myself up out of bed/ chair. Literally wasn't allowed to use my arms for a month. I also found it very hard to do some of the simple things like washing my hair.
The first couple of times during the expanding sessions, I had very little pain. Just a bit of discomfort where panadol was all I needed. (I was going weekly but it is your decision as to how often you go and how much you get expanded during each session). I ended up needing painkillers for the last couple and my plastic surgeon reduced the amount he expanded me during each session (from 100ml to 50ml). I was useless on those days as I couldn't find any position that was comfortable and the pain killers only did so much for me. I had trouble sleeping as well. But the pain only lasted 24 hours so I always knew that there was a light at the end of the tunnel. I found it uncomfortable to sleep on my side and some of my movement was still quite limited (although this could have been the initial surgery). I was also advised to not carry anything heavy during the expansion process so found myself quite useless since I couldn't carry things like groceries. If I did carry something too heavy, my chest would hurt.
When you have the expanders in, your breasts don't look as normal as the muscles sit in different ways. The bra in the journey kit with the padding was something i couldn't live without during the expansion process. It meant that I looked the same even though I didn't have any breasts/ "growing" through the expansion process.
My plastic surgeon discussed all options with me (trim flap, latissimus, implants) but in the end, it was only possible for me to go down the implant path. I was also advised that if I did have the option to go down the other paths, the recovery time would be longer and I would have additional scars.
I had my implants put in about 3 months after my mastectomy and that was the easiest part. It was day surgery with an overnight stay. I didn't need any painkillers. After that I was pretty much able to do anything as per normal (just no swimming until the scars had sealed). Initially the implants feel quite firm but over time, they have become softer. My implants have also dropped a little bit as the muscles have now settled down.
I am 7 months from my initial surgery and I am still getting used to my new implants and how they feel (all in a positive way) and work (positives and negative).