I highly recommend attending a class on the subject before you start.
My wife and I attended a free class at our Home Depot store and I was VERY glad I did.
We did it ourselves (floating laminate), it was our first time, and we did a fantastic job!
The main thing with the layout is to avoid ending up with really short or narrow pieces on the edges of the room.
Lay some boards out both directions to check before you start.
Also, be sure to stagger your joints well.