Will She Be Staying In A Hotel With...
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For more on marking an answer as the "Best Answer", please visit our FAQ.You should always only paper one wall at a time. So 4 walls - lets call 'em a, b, c, & d. You start on wall A and drop a plumb line (I think that's what it's called).
If your paper is 6 inches wide, drop the plumb line 5 inches from the corner of the room - this way you get an approx 1 inch overlap onto wall D. Paper the whole wall of wall A and when you get to the corner of wall A & B, paper a little overlap from A, of about an inch, onto wall B.
Then start the whole process again dropping your plumb line again about 5 inches in from the corner and papering over the 1 inch overlap (just so there's no gaps).
You may have a small overlap back onto wall A from your first sheet of paper on wall B - cut this off using the corner of wall A & B as your guide.
This means the paper will not match the paper that's come round the corner but will ensure you always have straight up and down wallpaper (especially important if you're using striped wallpaper).
Sorry if that sounds complicated - someone else might be able to explain better. I've only decorated a few rooms myself but this technique worked for me.