Why do you need a table saw sled? A table saw sled allows you to have significantly more control over your cutting projects than you would just with your hands, and allows for special cutting angles. A table saw sled also holds your work in place.
The best part is that you don't need to purchase a table saw sled at the store. Simply check out this video to learn how to make one yourself. If you have a table saw, you should really consider making a sled for it. It's one of the most useful shop jigs.