That image above is of switches that will be similar to what you'll find in your drive. You will solder one wire to one corner as an extension. To know where to solder the other lead just go to the opposite corner. This guarantees that you don't solder the leads to the same side of the switch, which would result in the circuit remaining open even if the button is depressed.
Let me try this:
1 2
1 2
1 1
2 2
Your button will be like one of the above situations, and it may be hard to know which. One side of the switch is already connected, but you don't know if it is oriented horizontally or vertically, and it can be hard to figure out sometimes. However, if you just connect the leads to opposite corners then you guarantee that you cross the to other side of the switch.
Does that make sense? I could draw it out but don't want to haha.