Don't just "slap" them on, Geez!! That'* just asking for trouble!! Take your time and do them right....
Seriously, tho. Do your very best to use the same amount of force tightening the lug nuts. Especially the front. The way I do it is:
While the car is still up, just spin them tight. Hold the wheel tight against the hub with your foot, shoulder, whatever, and basically "hand tighten" them with your lug wrench.
Once it is on the ground, give 'em each a good "grunt". Just enough to rock the car. Don't throw your body into it (unles you're a "90 pound weakling"), just basically as tight as you can get it with arm strength alone.
Try to stick to "normal" driving. No burn outs/rabbit starts/stops. Couple of days later, give 'em all a good "grunt" again, to make sure they haven't loosened/settled.
use the "every other one" pattern when putting your lug nuts on. This is especially vital to those of us who are forced to work without them fancy torque wrenches. It helps make sure the tire sets correctly, and that the pressure we do apply is distributed as evenly as possible.