As far as I know you will want to use rit-dye(spelling?) for the best,longest lasting results on carpets, but I could be wrong. I'd think the spray paint would be more of a touch up then color change method.
No, I masked everything off that I didn't want painted with masking tape.
I put newspaper on the windsheild and steering wheel (look for little holes on the newspaper and mask it off).
Used Old car towels covered on the door panels and carpet.
Used HUGE garbage bags on the seats.
Then painted it with the vinyl paint for the first solid coat.
Once that dried, I used the paint for plastic on it to give it the gloss look.
If you want better results you can take the dashboard out... BUT there is the risk of the paint being tacky still and will leave finger prints once you go to install it back in. Truely it's up to you which ever way you want to do it. I personally think it would be a pain in the ass. If you get overspray on the windsheild you can use a razor blade to take the excess off. Then windex the windows.
I should probably stop skimming through these DIY's.. I didn't catch the "only one coat of primer" the first time around so my passenger side panel looks retarded. I'll sand it down and redo it later.
If you can follow instructions, this DIY is great! The rest of us (me) should read a little more careful next time.
How is everything holding up? Thought about doing some of this on my Civic currently. Mostly thinking about the carpet, then the fabric on the door panels and arm rest, also the pillar pieces and headliner to darken everything a bit.