Put down some a few months ago and more to go soon. Wouldnt be too stressed about it, its fairly strightforward.
Tips:
Make sure you have a good circular saw (or other electric saw) to make neat cuts.
You shouldnt pack them absolutely tight - while they shouldnt move too much given that they are laminate, its no harm to give them some scope - plus small joints makes it look more realistic (as does larger "plank" style boards - the boards with the photocopy of 3 miniture boards look a bit crappy IMHO).
Never cut off both ends of the one plank because then the rest is useless, if you leave one end with either the groove or the connecting verge you'll get to use it somewhere along the line.
If theres an awkward corner like the verge of a door recess then probably best to start from that side of the room, otherwise you are trying to shoe horn a small pit of a plank into a tight space without the wriggle room you would get if you started the row there.
As other poster said, dont keep starting at the same side and moving in the same direction, vary the position of the joints and size up the full line of the row in case will hit obstacle, i.e. see last point above.