Greg,
good luck, I am sure you will do fine.
On the issue of swelling, of course no one really knows if there is anything that can be done to prevent it. I didn't take any steroids, other than one shot IV right after my treatment. I took a daily dose of curcumin, a natural antiinflammatory. I am not so much the natural herb/supplement person, but I thought it wouldn't hurt. I didn't have any swelling as evidenced by my subsequent MRIs, but of course there is no way to know if the curcumin actually played a role.
I also saw your question about taking the day after treatment off, I would say definately yes. You will be physically exhausted after a very long day, and you certainly need to give some time to your body to recover. I would say take it easy for a few days, try to rest as much as you can, even if it is taking 10 minutes off work to relax.
My best wishes for a successful outome.
Marianna