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user16171
The problem you will have is neither wall is likely to be particularly square/straight or parallel to the other. Get it level (using a level) and as square as you can (by eye or using a square if you want to measure how far out it is), which will mean it's slightly off square at both ends but no one will ever come and check the angle but you will see it every day.
Where is the door to the room, this is where you will look at it from mostly, and where will you be when hanging stuff up? Figure out where you will look at it from and do the best you can.