I did it in September many years ago and quite enjoyed it. The only challenging part is the length of climb up to Tamarack Ridge otherwise the rest of the trail is relatively flat. The trail is very well built and easy to follow and there are no technical sections. I think the "difficult" rating is because its a long distance and actually a backpacking route, nothing more.
Great trail that would be perfect for mid July. The north part of the trail is not heavily traveled and quite enjoyable but Rowe Lakes is a bit of a circus at times.
Which route are you planning to do? If you are doing a car shuttle do yourself a favor and go the Blackiston creek route, the trail to twin lakes is a boring gravel path and the campsite isn't much better. Lone Lake is a pretty campground, worth spending a night.
Not the fastest, but I get to where I am going and enjoy it.