Tiles.... I hope my last questions befor the job begins.

Tiling a bathroom floor and walls. I have arranged for the plumber to rip out old, let me tile, then fit the new stuff so that will neater and save me trying to cut round 1st question.....Do I tile the floor and then the walls down on to the floor OR do I tile the walls and the floor up against the wall tiles, does it matter?
2nd question.....regarding finishing the door area I assume when the door is shut I should only see the carpet from outside the bathroom and only the tiles from inside, so I know where to start /stop the carpet/tiles. How though do I edge this join I only know of the normal metal carpet gripper type edging but is there a special type for carpet to tiles?
Thanks, and thanks for all the replies to my previous questions, has been very helpful.

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