Ah, layers... I had them back in the day when I was relaxing my hair, but none since it was natural. Having layers won't affect anything with my technique. This is because when you define your curls you'll be letting each curl do it's own thing. This means they don't need to be all the same length. Mostly, if you leave the conditioner in you hair as I do, maybe leave a bit more in the shorter layers (the shorter your hair, the tighter it tends to curl).

When you do wash, condition and comb your hair, make sure to take each curl, and smooth it to define it, cut down of frizz and give them definition. Let your hair totally dry. Once you set each curl, never ever comb, brush or fingercomb your hair. At night, put all your hair up in a bun or two, or one (or more) braids. In the morning lightly smooth a little water and more conditioner on it to refresh the curls (maybe putting less water on the shorter layers to keep them looking longer so they can match the longer layers). By putting your hair up at night, this can help "stretch" your shorter curls (if they tend to want to curl up tighter than the longer layers) so their curliness can better match the longer layers of curls.