We're snaps. All snaps. No velcro (your laundry will thank us later). I will send you a video or two so you can see some snapping in action.
Has a bit of info on how-to for snapping (plus a video). That should get you through the putting-on part.
While the covers have a waterproof barrier between layers, if your inserts are full, they're going to leak out via tummy and legs area. Here's a bit about change routine:
And for laundry please look at this link which has a lot of resources for laundry: http://www.fluffloveuniversity.com