hey dude,
With the paints, what i used was the septone automative spray paint range. I used the "acrylic gloss black" for the chrome bits and the "heat proof" one for the rest (achieved the matt black look). They also have a 'matt black' one available and it should achieve the same result.
Make sure you sand down the surface and then use some primer. I got the "holts dupli-color auto spray" plastic trim primer. The guy at the paint shop will know what you want.
The chrome part took ages, word of advice. Thin coats until you get the look you want, and spray a coat of primer between each coat.
With the screws, those things are all over the car, and some are easy and some are a b*tch to take off. its just the luck of the draw i guess.
Oh and the sti lip, been dying for one for ages.

The only thing i gotta do black now is the bottom part of the front bumper, ive got some silver mesh in that gap. need to spray it black now. just havent had time to take the bumper off. once complete, ill post some photos up for you guys.
Enjoy and post some pics up when your done!