Hi Theham and welcome,,
I received my Cochlear BAHA 4 in 2014. I was SSD for 3 years following my surgery in 2011. I don't remember much about the recovery time except that it wasn't very bad.
I am currently in the process of updating to the 5 power and I'm really excited! I'm hoping it does much better than the 4. I have never really been satisfied with my hearing with the 4,, I don't think it is strong enough. I have had the processor adjusted several times and sent it in for repairs twice during the warranty time. I may have gotten a bad processor too.
If you have been SSD for 38 years,, you may have a hard time adjusting to it. I blamed 3 years of SSD for having a hard time using the BAHA. I really prefer to leave it off on days I stay home,,, my tinnitus is bad in the AN ear and it seems to just interfere with sounds.
I'll be interested to hear how you like it after activation. As far as cleaning abutment,, I received a VERY soft toothbrush in my kit to use in the shower or anytime to brush around the abutment. As I don't wash my hair everyday,,, I don't seem to clean it real consistently, it will get irritated though if I'm not careful,,, the skin does not adhere right up to the metal post so bacteria can get under the skin. You have to learn to be diligent about cleaning it. But I can feel it getting red and tender if I'm not careful,,,
Good luck and let us hear how it goes for you,,,