eddieg 2008,

Yes you can do it. Be careful to match the piece you need when you find out where your taking it from. Oversize the piece.
Using a level and a pencil, mark the area you are going to remove. Score the outline with a wallpaper razor knife gently. Sanitest comes off real easy, paper is harder.
Using warm water with a sponge and 1" scraper start wetting the area your removing. Apply and apply and each time start working the knife under the paper. After a while, you will eventually remove the piece you want.

You can either just paste it over the area thats missing, a fair job. Or you can wallpaper razor knife through both pieces of wallpaper and remove the new piece and then carefully remove the edging remaining. Now paste the new piece right in place.
Whalla! Done.

Patience helps. Let the warm water have time to work its' way into the paper.

Good Luck,

All the best,

The PorchGuy

Here is a link that might be useful: My Album