Bob ~
Great news, indeed! Being productive (and paid) is always 'good medicine'. I think your concerns about handling a new job are perfectly valid but you don't seem to be the type that allows his fears to make his decisions. I can speculate that you'll definitely feel tired at the end of a workday and you may have to scale back your hours to stay at your peak, so I hope you'll be able to start part-time or at least not be expected to be at 100% on Day One. After all, you did have brain surgery. You've obviously recovered but it will take a little time to come back to where you were, pre-surgery. That should be obvious. Still, I like your intrepid attitude and of course, I applaud your willingness to take hold of this job opening. I think you'll be able to handle this and besides that, you'll have lots of folks cheering you on, including me.
Jim