On receipt of the carpet tiles they should be left to acclimatise to the room temperature for 24 hrs. Although no underlay is required the sub floor needs to be flat, and free of dust so the adhesive works as it should. If the floor is uneven, you will need to lay a self levelling screed if it's concrete, or lay plywood if it's floorboards.
The arrows on the reverse of the carpet tiles indicate the direction of the pile, helping you to either lay in a broadloom or chequerboard fashion as indicated below...
Starting from the centre of the room and not the edges. You can quickly find the centre by draing 2 chalk lines from opposite the walls...
If using a spray adhesive you can spray the floor as you go along laying the carpet tiles straight into wet adhesive. If using the tackifier adhesive brush or roll the adhesive onto the floor and allow 40 min for it to set. It will dry to a tacky film, then start laying from the centre outwards.
Fit them butt against each other and press down firmly.
Fitting against walls
In order to get a good fit against the walls follow these simple steps...
Step 1. Lift the last uncut tile which is marked as "A" in the diagram below and replace it with the tile that will be cut, which is marked as "B" in the image below.
Step 2. Place tile "A" on top of tile B, and firmly against the wall. Using tile "A" as a template cut through tile "B".
Step 3. Then finally place the uncut tile back in its original position, and fit the newly cut tile you have up against the wall. Repeat this same sequence all around the edges of the room.