How many days are you taking to do the trail, and are you caching anywhere? The two places I can think of that might be an issue in these shoes are the approach from Carbon River to Mystic Lake---very large rocks, we had to pick our way amongst them in some places, and maybe the Summerland side of Panhandle gap, although I think it's mostly gravel there, some rocky areas. We did it last year, going up through Spray Park rather than Ipsut Pass, and Spray Park is fairly rocky on the Carbon River side as well. Otherwise, it's good trails and you should have no problem--although, I haven't looked at the trail conditions site yet, don't know of any rock slides/washout areas. Take it slower and watch your foot placement and you should be fine. Since you say you haven't trained extensively in them, if you are caching at all, you might consider placing another pair of trail shoes in a bucket to switch into if your feet start giving you trouble. We crossed several snow fields with trekking poles, didn't use any Yak Traks, and did fine, but we may have had more lug to our soles.
Where are you starting, and which direction are you going?