In July, T-Max, Guiness and myself did the Dix Range beginning w/ Macomb via the slide. It was my first (and so far only) slide, and I didn't think it was all that hard. It's pretty easy to find the herd path, which more or less follows the brook to the base of the slide. When we did this route the blowdown had been cleared up to a point.
Once on the slide, just be very careful to not kick rocks back at others behind you-it's what slide-climbers call a "dirty" slide, meaning there's a lot of debris. It's a pretty short slide though, and while steep, not any steeper than a lot of trails. Just two points I'd make:
-You're planning on coming down the slide as well-descending this type of thing is generally harder/more dangerous. Just be careful though and you should be fine. Two guys coming out to the Elk Lake trailhead after us had gone down that way. Even more importantly:
-I wouldn't want to do it if it's wet. Try to go on a day when it hasn't rained for a day or two and there's very little chance of rain.
Just the fact that you're posting about this shows that you're thinking it through carefully. I'm sure you'll be fine. Good luck.
Matt