I must start this first by saying please excuse my terrible pictures. i didnt take any while doing it since my hands as well as a friends, were busy holding the fabric in place. the pics i have will be perfect for you to figure things out also, i didnt have a plastic headliner piece or anything, just a metal roof. if you want to do things like me pull it out and follow the steps, or remove it, wrap the fabric around it, then re-install it. since i dont have a headliner i have no idea how to do that 
here goes 
Difficulty: * out of *****
Time: about half an hour
Materials Needed:
Fabric of choice (50" x 50"... plenty of extra to work with) ~$7
Scissors
Razorblade
3M Spray Adhesive $10
Ruler or other flat thing to push air bubbles (I used a license plate :P)
A friend, family member, helper of some kind
Price: (assuming you have a razorblade, scissors, and dont have to find a friend of craigslist...) $17
spray adhesive:
Fabric can be found at Joe-Ann Fabrics or Wal*Mart
Step One:
This is your roof, assume black is the actual metal... i warned you to excuse my pics remember?
the first trick to hold your fabric (mine is pink) in place is to open your hatch (if you have one) and tuck in enough just so it holds and hangs down, looking like this:
if you do not have a hatch, simply skip this step, its just an easy way I did
Step Two:
Spray the adhesive, after shaking can well, to both the roof and fabric. apply liberally, but not so much so it is soaked, depending on your fabric. I used felt. It didnt absorb the glue so it worked well, you'll know and if you use to much no worries, it'll dry.
Let stand for a minimum of 30 seconds. this allows the adhesive to begin to dry and get tacky. When it's really tacky, like 30 to 40 seconds depending on wind if outside or w/e, proceed to next step.
Step Three:
Using a friend or helper or whatever, lean driver and passenger seats all the way back, lay down, pull fabric tight, and firmly press the glue together. It should immediately stick, so flatten FROM THE CENTER, This reduces air bubbles and sags. Use whatever you have for something flat, smooth out the fabric, but act quick, then get back to applying pressure. A minute will do, your arms get tired quicker than you think.
At this point you can simply repeat steps two and three until everything is in place. Remember to add some extra glue around the edges so the wind doesn't get up under there. Once all glued, proceed to the next step.
Step Four:
Get your razorblade and be careful. Lets start at the windshield. Feel for a deep ridge, its extremely hard to miss. Cut along using that ridge as a guide. Your not cutting along your windshield or weather stripping so dont worry. Then move above the windows. Again, feel for the hard to miss ridge, use it as a guide with a downward angle so that the fabric, once cut, will line up perfect with the door molding. Repeat for the rear windows and back window. If you tucked into the hatch simply open the hatch and use that as a guide. Dont forget your interior light!! Simply poke a hole in the center, then cut it out, since its its own little hole this is the easiest cut ever.
Thats it your done!! Again, I apologize for my lack of pictures, but I dont think you truly need pics, but it's helpful i know
This was my first write-up so let me know if anything is unclear 
Curious?
http://forums.nicoclub.com/zerothread?id=335278
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