Hello and welcome to FISD. Firstly, what's a gir...?? What kit make do you have? You should have a local Garrison/squad to help you with fitting etc.... We do things a little differently down here,..... test fit, trim, test fit, trim... repeat... eventually ya in your own TK kit. Never be afraid of using *beep* loads of masking tape to help getting in the armour prior to gluing.