I am 5 weeks out from my septal myectomy. One of the best things, in my opinion, was the thoracic splint they gave me..like a chest "hug" for support. I found it made maneuvering up and down, in and out of the car, and especially wearing a seat belt so much more comfortable. I wore it up until a week ago as it kept me from doing too much stretching early on. I wore it over my button up shirts and front close lounge bras which I preferred, but everyone is different. Fortunately, you will get a lot of good help while there from the different disciplines...PT, OT, Respiratory, besides the nurses. You will also get a special pillow for coughing or sneezing. We drove 2 days to and from western CO. I did have some muscle spasms/cramps in my hands, upper back, but I was given a muscle relaxant which worked great until my electrolytes normalized.
I found the Mayo/St.Mary's staff listened to my needs and helped me before and after my discharge from the hospital. I hope that reassures you a bit more.