:welcome:Geraldine - My wife and I have fond memories of Western super mare - 28 years ago! A lovely place.
Glass mosaics - small of large - how big an area - kitchen splashbacks- need a glass cutter, tile cutter or wet wheel.
Must use ultra white adhesive and the skill is not to make the tiling look as though it comes on sheets.
You'll need a rubber squeegee to push the tiles flat onto the walls and also to grout and an adhesive trowel that will not put more adhesive on the wall than necessary ie.4mm depth ( clean all joints before grouting).
With mosaics the preparation of the walls is essential - the smooth/flat surface to tile on will provide a smooth/flat tiled wall.
Timeless John.