For those of you who are diy'ers:
Install quick-click flooring from right to left if you value your sanity. Just a little detail they leave out of the instructions. And left to right tends to feel more natural.
It took me two and a half rooms to figure that one out. I are dumb.
Pro tip: It depends on which way the tounge and groove is oriented. I've installed many of these, including in my house. I always have the tongue facing away from me so the groove is left exposed for the next row. I always go left to right.
Typically you tilt the small tounge into the groove on the left and drop it down as close as possible to the long tounge being engaged. Then lift the whole plank to tilt in the long tounge. Sometimes it will click right in, other times you need to use a piece of scrap flooring to smack it in with a hammer.
The fun part is when you have to go around/under things which prevent you from being able to tilt it in.