Welcome Shane! I'm glad to hear you're looking to jump into traditional bowhunting. There's nothing quite like it! You'll be glad you did!
I don't have nearly as much experience with bear hunting (my only dangerous game experience) as many here, but I can say that if you're going to go bear hunting on the ground spot and stalk with a traditional bow, you need to have a predator mindset. If all you will do is worry about getting hurt, you won't have fun, and you won't close the range or thoughtfully make key decisions, or potentially shoot poorly. I'm speaking from experience. Every stalk will be dreaded.
Now, with that said, fear is a double edged sword. It can paralyze or drive us to do extraordinary things. The danger aspect can be thoroughly exhilarating. Being on the ground 20 yards away from a blackie is an awesome experience. That particular exhilaration will not come without the potential for injury. I've never been "comfortable" this close to bears, but I have been confident. To me, that makes all the difference.
In my opinion, if you're worried about getting hurt and working up the wife, pick up a rifle and get it done that way. You could also consider bringing along a rifle backup as well. I'd recommend you shoot some other game with the Martin to get your confidence up. Then when you have the confidence to make the shots under adverse conditions, try for black bear. Bad shots will happen from time to time...we're human, but we need to be to the point where we're confident in our abilities. No one can tell you when you're there...only you can. We owe our quarry nothing less.
Happy hunting!
Cheers, Matt