Step 1. Measure for your first drop
Before you start, read the instructions that come with the wallpaper. After this, measure the width of your wallpaper. Deduct approximately 5 centimetres from this figure, then use the tape measure to mark this distance out from the corner of the wall. From this mark, use the spirit level and pencil to run a straight line from the top of the wall to the bottom. This line is where the edge of your wallpaper will be. You need to allow the wallpaper to overlap onto the wall next to it, so you can cut it cleanly in the corner, after hanging it. 
Step 2. Mix the wallpaper paste
Read the instructions on the wallpaper paste packet. In a bucket, add the necessary amount of paste to the required amount of water. Use the stirrer to mix this until the paste has a thick consistency then pour the paste into the paint roller tray.
Step 3. Apply the wallpaper paste to the wall
Working from the corner, use the paint brush to apply the wallpaper paste to the wall where you’re going to hang your first drop. A brush is ideal to apply the paste in the corners and along the edges. Use the roller to apply the paste to the rest of the wall. Make sure to get even coverage with the roller. Overlap when applying the paste and roll and brush it beyond the pencil line you drew with the spirit level.
Step 4. Hang the first drop of wallpaper
Get up on the ladder and line the end of the wallpaper roll up with the top of the wall. Also line the edge of the wallpaper with the straight line that runs down the wall. Now run your hand over it, so that it sticks to the wall. Step down from the ladder and unroll the wallpaper until the roll is sitting on the floor. Cut the wallpaper from the roll, below the wall.
Step 5. Smooth and trim the wallpaper
Use the plastic wallpaper smoother to smooth out all of the bubbles and creases in the wallpaper. Work from the top of the wallpaper to the bottom. Make sure you smooth all of the wallpaper because it also helps it stick to the wall. Once the wallpaper is smooth, use the utility knife and straight edge of the smoother to trim the wallpaper in the corner and at the bottom of the wall.
Step 6. Hang the second sheet of wallpaper
Apply paste to the wall where your second sheet of wallpaper will hang, using the paint brush and roller. Apply the paste evenly and wider than the width of your wallpaper. Stand on the ladder holding the top of the wallpaper and line-up the pattern on it with the wallpaper next to it. Then follow the same process as Step 5.
Step 7. Hang the rest of the wallpaper
After hanging the first two sheets of wallpaper, continue applying paste to the wall and hanging the sheets of wallpaper until you have covered the entire wall. Make sure the wallpaper matches the pattern of the sheet next to it and follows its straight line. 
Step 8. Trim the wallpaper for a powerpoint
If you covered a hole or powerpoint with wallpaper, you need to cut the wallpaper so it can be installed. Before you start, turn the electricity in the house off. Feel where the hole for the powerpoint is, then use the utility knife to cut from corner to corner of the hole, leaving an X shaped cut in the wallpaper. Have the powerpoint installed by a licenced electrician.