Laying Adhesive Vinyl Floor Tiles
The first tile you lay is the most important. If that tile is off, the rest will be off too. Work in quadrants. If you are nervous, lay the tile with the paper backing on first. This may be more time consuming, but you'll get a better visual which will help you feel more confident. You will likely have to cut tiles to fit the edges of the room and around spots such as vents. A tile cutter will make the job easier and more precise.
Once you have laid the adhesive vinyl floor tiles, roll over them with a heavy tile roller (or rolling pin) to help the adhesive bond.
Lastly, don't wash the floor for a few days to allow the adhesive to cure.