Is there *always* an exit from a boss fight if you want to leave and repair your equipment, get better gear, gain another level or two, etc? There are some tough boss battles in this game. I am worried that sooner or later I will find myself in a fight I just cannot win. Since there is no going back to a save game like in other TES games, I am a little worried about losing weeks (or months!) of building a character, just to be caught in a battle I cannot win.
I mean, I want to try every quest that comes my way, even if it is a little above my level. But I want to be sure that if I get in over my head, there is always a way to get back to town and try again later.

Thanks!