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You have to remove the bracket assembly (that holds the grille) from the header panel.
First you want to remove the bumper cover, it isnt nesecary but it saves a couple hours of time. Second Remove headlights, if you havent while taking the bumper cover off. Third there is a couple bolts holding in the header panel, remove those and then there (may) be a wire clipped into the back of the header panel, if so carefully remove it. Fourth repeat all previous steps in reverse for installation.
Ford/gm bolt circle differs.
take arm rest off, take inside door handle and window handles off and then take screws out around the bottom of the panel and get something that will fit between the door and panel and pop the clips out all the way around and the panel comes off.
Not without serious modification
you should only wear a temporary crown until your perm. crown comes in. a temporary crown will eventually break or come off if the temp comes off and you dont get the perm crown on your tooth could shift and the perm crown wont fit then you have to start all over and may be charged a lab fee to remake the crown.
The center panel on the trunk lid comes off there are about 8 nuts on the inside of the trunk lid, and there are 2 bolts for the tag light and 2 more behind the license plate then gently pull the panel off
depending on how big your rims are , a crown vic doesnt need to be modified to fit 20" rims , but in order to fit 22's or even 24's.. you need a lift kit , basically something you would install in a truck to fit bigger tires for off roading same apply's for a car