Body Kit Help, New to fitting body kit parts... Options

[celicaboy04]

I got the Invader kit from 97Celica and am having a bit of trouble.

The sideskirts I have I cannot seem to fit right. They are about the right length, but the side skirt will not closely hug the car so there is a slight gap down parts of it. Is this normal? Also, parts of the kit seems to be chipping and stuff while Im working with it so I should just be able to spot fix that with resin right? And how would any of you suggest I hold the sideskirts. In the front where the tire well is I will use those existing screwes, in the back I was going to get some self tapping screws to go through the kit and the metal, though in the middle of it where the door sill is i havent quite figured out yet...self tapping screwes again?

I havent even gotten to the bumpers yet, I have been having a hell of a time trying to locate all the screws and stuff holding them in, though I do know about the front bumper having to be shaved where the safety bar is so it properly fits.