The corners are often out of line, which makes it unlikely to take one length around a bend. Measure the distance from the corner, at the top and bottom of the last length. Add an extra inch to the widest top / bottom measurement and mark a new length with a pencil, the required correct width.
Cut the required width length and paste. Press the paper into the corner and mark it to reach into the corner. Peel the paper back and cut to allow the length to reach the corner and wrap round the corner by a very small amount.
Complete the adjacent wall in a similar fashion, using the cut off length just discarded from the previous length. Any slight break in pattern in the corner should be negligible.
Extra adhesive may be necessary to stick the wallpapers together if there is a slight overlap in the corner.
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