Thane is sure of his abilities and has given himself no reason to doubt them. If he misses something or stumbles in his ill state it is not for lack of skill.

"I see no reason why you shouldn't. Given enough time and patience anyone can learn it. Once you have your stance and grip down it shouldn't be too difficult."

He prefers knives himself, but that's not important.

"As long as you're sober when you do it, of course." As that foolish man learned earlier.