Flooring Tile - WALLS OR FLOOR FIRST

HAVE GUTED A 5X5 SHOWER STALL , AND REPLACED IT WITH A JACUZZI CORNER UNIT BATHROOM IS KNOW A 5FT X 11FT JACUZZI WITH SMALL DECK AROUND TUBE,PLUMBING,ELECTRICAL IS COMPLETE, I HAVE BACKER BOARD ON DECK,WALLS AND FLOOR IS 3/4 PLY WITH 2 X 1/2 SHEETS OF WONDER BOARD. I WILL BE USING 13 X 13 FLOOR TILES AND 8 X 13 WALL. I WILL HAVE TO MAKE LOTS OF CUTS ON BOTH WALLS,FLOOR,AND DECK. DO I START ON THE WALLS FIRST OR FLOOR AND DECK. HOPE THIS IS NOT A FOOLISH QUESTION

I like to do the walls first. That way I'm not tramping all over the new floor and spilling all sorts of bad things on it.