Seal porous surfaces either with diluted wallpaper adhesive or with a wall size, following the instructions on the packet, and allow to dry – this seals the surface, improves adhesion and makes it easier to slide around wallpaper for pattern matching.
For a neat finish, centre the paper on the wall. Start papering in the middle of the wall and work outwards – this is particularly important on a small area such as a chimney breast. Decide where this centre piece will be, then hang a plumb line against the wall and mark along the length of the cord with a pencil.
Measure from above the skirting board to ceiling, add 10cm, and cut paper this length.
Lay the paper pattern side down on a pasting table and thoroughly paste the back, making sure the paste goes right to the edge of the paper. Fold carefully into a concertina and leave for a few minutes to allow the paste to soak in (check times on the label).
Hang the paper with the edge along the vertical pencil line with about 5cm overlapping on the ceiling and at the skirting then smooth it onto the wall removing any bubbles with a pasting brush (work from the centre out). Score a crease neatly along the ceiling and skirting board lines with the edge of your scissors, lift the paper then cut off the excess and smooth flat. If the edges or corners lift, apply more paste with a small brush and smooth down. Wipe away excess paste with a damp sponge.
If hanging a patterned paper, measure the second piece on the wall against the first once it is hung, as the pattern may fall in such a place that a very large overlap may occur at the ceiling. Trim this overlap to a manageable size before you paste.
Work your way along the wall, carefully butting up the edges of the paper drops but do not overlap. Run a seam roller over the joins where two pieces of paper meet to ensure they are totally flat.
On the last drop, crease the paper into the corners and trim. A wallpaper trimming wheel makes this easy.
When cutting wet wallpaper only use scissors or a cutting wheel. Do not use a knife as this can drag through the paper causing an uneven torn edge.