Hi B.,
I had the surgery last year. Following the surgery, I had to stay in the hospital for about a day so that they could monitor my vocal cords. I really didn't have any problems with the surgery. I really wasn't out of commission after the surgery. I pretty much fell into my regular routine right after I had it done but I do think I have a high tolerance for pain so you may feel differently after your surgery. I think the only real restrictions that I had following the surgery was that I couldn't go swimming for a number of weeks afterward -- I think maybe 8 weeks -- and it took about a week or two for me to fully be able to turn neck, making it possible for me to drive.
Two things that you may want to check on with your doctor before the surgery are: (1) making sure that a plastic surgeon will be there to close up the incision while you are in the operating room so that you do have a nice clean scar after it heals; and (2) making sure that you have a lab pathologist there in the operating room to test the mass to determine whether it is cancer so that you will not have to go through a 2nd surgery the following week to perform a complete thyroidectomy if it does turn out to be cancer.
Like I said it has been a year since I've had the surgery and no one notices my scar. I was lucky that my ENT had also been a plastic surgeon before switching to something more meaningful (his words, not mine). I would suggest that you go out a buy a number of cute scarfs to wear during for the Summer and Fall so that you are able to protect your scar from the sun (sun damage will make the scar stand out), and a tube of 99% aloe vera gel to apply on your scar to help minimize it's appearance.
I hope this answers most of your questions. If you have any other questions or concerns, feel free to send me a private message and I'll help you any way I can. I hope all goes well for you and the surgery.
Sending you prayers of healing and light.