A really good link that. I like the bit about folding the paper concertina style as not many sites would tell you that and not doing it could cause problems with the paper stretching. The only thing I would add would be to smooth out the paper as you go and not leave it hanging as this would defeat the reason for folding it concertina style in the first place. Just hold the folded paper in one hand while smoothing out the bit you just put on the wall or get someone to hold the folded paper if you do not feel safe doing so.