As garythetiler dont rush.the setting out has got to be right,speed comes with experiance.
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if it is a small floor i dry lay the lot and then use a good rapid set like Webber SPF or Variset XP it is not madness in some situations it actually saves time.Use a tile staff !!!
Dry laying is complete madness !!
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3,4,5 is 3 lines with measurements with a ratio of 3,4,5 creating a right angle triangle. So for example you have a line 30cm long put a 40 cm piece of string at one end and strike an arc. Then get a 50cm piece of string with a pencil say and strike an arc, where the two arcs intersect above the original 30cm line will give you a perfect right angle. To make the triangle bigger you can have a line say 60cm;80cm;100cm, as long as the ratio is 3,4,5 you will create a perfect right angle, whatever the measurement unit is.