Yes, wallpaper installation is something you can do by yourself with the right preparation, tools, and patience. Here are some steps to help you with the process:

Prepare the walls: Ensure that the walls are clean, smooth, and free from any imperfections. Repair any cracks or holes, and remove any old wallpaper or loose paint.

Measure and cut the wallpaper: Measure the height and width of the walls accurately to determine the amount of wallpaper needed. Use those measurements to cut the wallpaper into strips, leaving a little extra length to allow for adjustments during installation.

Apply adhesive or activate pre-pasted wallpaper: Depending on the type of wallpaper you have (pre-pasted or unpasted), follow the manufacturer's instructions to apply adhesive or activate the pre-pasted backing.

Hang the wallpaper: Starting from a corner of the wall, carefully align the top edge of the first strip with the ceiling or a level line you've marked. Smooth the wallpaper down, working from the center outwards, to remove any air bubbles or wrinkles. Use a wallpaper smoother or a squeegee for this process. Trim any excess wallpaper at the ceiling and baseboard using a sharp utility knife.

Continue with additional strips: Hang subsequent strips of wallpaper, aligning the pattern or design as needed. Take care to match the seams properly and smooth out each strip as you go. Use a seam roller to ensure a secure bond between the strips.

Trim and finish: Once all the strips are installed, carefully trim any excess wallpaper along the ceiling, baseboards, and corners using a straight edge and a utility knife.

It's essential to follow the specific instructions provided by the wallpaper manufacturer for the best results. Additionally, having a helper can make the installation process easier, especially when handling long strips of wallpaper.

To determine the number of rolls of wallpaper you need, you'll need to consider the following factors:

Wallpaper pattern repeat: Check the wallpaper pattern repeat, which is the vertical distance between where the pattern starts and where it repeats. This information is usually provided by the manufacturer. The larger the pattern repeat, the more wallpaper you'll need.

Wall measurements: Measure the height and width of the walls you plan to cover with wallpaper. Ensure you measure each wall individually, as walls may vary in size.

Wallpaper roll dimensions: Check the dimensions of the wallpaper rolls you're considering. Standard wallpaper rolls typically come in widths of 20.5 inches or 27 inches and lengths of 33 feet or 27 feet. Note that some rolls may have varying dimensions.

To calculate the number of rolls needed, follow these steps:

Determine the total square footage: Multiply the width of each wall by its height to find the square footage. Add up the square footage of all the walls you plan to cover.

Account for pattern repeat: If your wallpaper has a pattern repeat, divide the pattern repeat height into the wall height to determine how many times the pattern will repeat on each strip. Round up to the nearest whole number.

Calculate the number of strips: Divide the width of each roll by the width of one strip (accounting for any overlap) to determine how many strips you'll get from each roll. Round up to the nearest whole number.

Determine the number of rolls: Divide the total number of strips needed by the number of strips per roll. Round up to the nearest whole number to ensure you have enough rolls to complete the project.

Keep in mind that it's always a good idea to buy an extra roll or two to account for any mistakes, future repairs, or if the wallpaper has a high pattern repeat.

If you're unsure or want to be more accurate, consider consulting with a professional wallpaper supplier or installer who can help you calculate the exact number of rolls needed based on the specific wallpaper you have chosen and the dimensions of your walls.