This slide is commonly called the Lake Arnold slide. The bottom of the slide is very easy to see from the trail, as the large open rock area comes to within about 100 feet of the trail, and there is little or no undergrowth.
Like any winter outing, what you need depends totally on conditions. All the usual cautions apply, regarding avalanche, falls, etc.
This particular slide is generally low angled for a considerable distance. Once you get part way up, the main slide becomes quite steep for the last few hundred feet. As this is a fairly new and clean slide (1990), the top is bare rock that often does not hold snow or ice. You might get into rock or verglas up there. Near the top, there is an older slide a couple hundred feet to the south that is vegetated, and holds snow and ice. Depending on your preference, you might want to finish on that slide. When I ski the slide late in the season, that's the route I descend.
TCD