You need to have great armor, a high rating for that armor, and great weaponry. You also need to be high enough level to be competitive - at a gross estimate, I'd say level 20 or higher.
I've NEVER had problems with briarheart. Yeah, they are pretty tough, but a couple of solid hits and they're hamburger meat like the rest of 'em.
Yeah, try it without smithing or any other crafting on expert or master. Good luck. I am level 40 btw wearing Ebony armor, Daedric boots, Orcish helmet, Orcish gauntlets, and the Shield of Ysgramor.
Do you use cooking? Vegetable/Venison/Beef soups. They give you stamina recovery. I think you can go up to 3-4 points of stamina regen per second. Not precents, points. You need only 1 point of stamina to do a bash or a power attack. If nothing changed with the recent patches - I have modded food, so I no longer have that bonus.
You can use this when facing them.
That would be awesome except that I am not using any crafting. To be honest though, I have never cooked food in the game.