Okay, since I've taken the time to remove my grill I may as well post some pics for future reference and add a little "how to"...
To make this as easy as possible you need to remove the upper shroud. This is the plastic piece that "links" the top of your upper grill to the frame/chassis. This is a simple removal. Eight "pop" clips that are easily removed with a flat head screw driver. Simply insert the screw driver and twist/pry the center of the "popper" up and wiggle it out. The two outer "poppers" are a different length so make sure to keep them seperate from the other six.
To make it even easier and give yourself more access you can remove the upper grill as well. This consists of two self tapping screws and four more "poppers" along the bottom edge of the grill. You need either a "stubby" philips screw driver or a right angle philips. A ratcheting right angle screw driver is even better
Once all the upper garb is out of the way you can reach down from the top much easier. I have a Mugen grill so this little luxury is not available to me

Not that big a deal though...unless you have uber pumped up biceps you will be able to reach down from the top.
There are five "tabs" across the top, four "tabs" that you can't see across the bottom, two "tabs" at each end and two "poppers" at the bottom of your lower grill.
Start with removing the two poppers. Next, put your hand through the front of the grill and push "up" on the upper tabs.
Work your way from left to right (or right to left). All you want to do is dislodge the grill along the upper edge by an 1/8" or so. Using a flash light you will be able to see these tabs by laying on your back.
Once the top is dislodged you need to reach in from the top where you removed the upper plastic. When you feel along the bottom edge you will locate the four bottom tabs.
Givem' a good feel

The easliy moved wide portion is the nose plastic. The thicker part that you feel is the actual grill clip. I used a .035 thick feeler gauge and slid it in between the nose plastic and clip and gave it a little twist and pushed from the face. Again, dislodge the lower all along the lower edge. Once you have the grill dislodged across the top and bottom it's a matter of pushing it inward. Once it pops free into the nose cavity you can simply lay it on it's side and pull it out the nose.
And now your grill is out...what are you going to do now?