So you have a Tiling job to be done? Know where to begin? Besides the tiles themselves, you will also need a good adhesive as well as the proper DIY tools (and clothes). And check that your tiles are of a suitable material and quality there should be no reason why you cannot ask someone at your DIY retailer any questions you may have. DIY retailers include Great Mills and Wickes.
If the prospect of DIY excites you, it is probably because you are so looking forward to seeing what the outcome will appear like (this coming from someone who has no DIY history!). You may even find yourself recalling similar bouts of enthusiasm for similar projects when you were a child (it tends be more common in boys, rather than girls, from my experience). But don't jump in just yet, even after you have got all your safety precautions manifested; always begin by cleaning the base floor. For even the smallest spot of grease or oil could mean that your adhesive will fail to do its job.
The idea is to begin from the centre of the place where the tiles are to be applied. And it is easy enough to find; get out your tape measure and find the middle points of opposing walls, and draw a line connecting them. By logic, the dead centre will be where the lines intersect. Then you apply adhesive: spread 1m2 of it; use the notched end of your trowel to make ridges in it and then lay down the first tile, in one of the quarters snug to the intersection. You have to push down on the tile but do this gently! By placing plastic spacers at the corner of each tile, you can keep equal distance between them easily.
Then begin working from the centre outwards, heading for the walls. Keep laying down tiles until you eventually get to the walls with whole tiles. Do the whole of one half first, followed by the whole of the other half. Then fit the tiles adjacent to the walls: with a tile cutter, this is easier than you may think but wear eye protection (i.e. flying tile chips!). Note that adhesive takes some 24hrs to set.
Then pull out the plastic spacers and grout it all spread it diagonally. You wipe away the excess grout with a wet sponge (rinse it regularly).