If the cupboard has a gloss paint or vanish on it, you will have to sand. Sanding allows the paint to stick to the surface. I would give it a sand reg ...

I had tiles I didn't like so instead of removing them I just tiled straight over them. I can't see why you couldn't just tile straight over the glass ...

You need hot burning beads to start off the snake, instead of lighting up a fire in the webber, you heat up a bunch of beads until they are alight on ...