What you will need:
Nitromors paint stripper - 500ml can should be plenty for a frame/fork
A Power drill, and a Wire drill attachment
Wet & Dry paper (240, 400 and 600 grade)
AutoSol metal polish
You can get pretty much all of that in B&Q, for not too much £££.
Firstly, make sure you start early in the day. It does take a long time, but it is well worth it. You do not want to still be doing it as it gets dark, or inside, because you wont be able to see f*** all.
1. Do what it says on the Nitromors tin. Frames, especially Zebdi's, have very thick paint, so this part will take some time. You want to coat the whole frame, one bit at a time, not missing a thing. Once the frame is coated, leave it for about 30 minutes. Once the paint has bubbled, get the drill and blast all of the old paint off. Clean it all off with some water and dry it. There are bound to be loads of little bits of paint left, so keep repeating these steps until the paint stripper wont get any more off (trust be, there are always some bits!).
2. Once you have got to the stage where the stripper (ooer) won't remove any more, its time to attack the little bits with the drill. Its easy work. Once the frame has all been stripped, it should look a mucky aluminium colour. Wash it all down, and get ready for the worst part.
3. Starting with the 240 grade, wet the paper and rub the whole frame down. Its easier to do it one bit at a time, starting at the headtube, then toptube etc. You really have to make a good job of this, or it will look very patchy. The 240 grade will smooth the surface only slightly. Then its time for the 400 paper. Repeat above. Finally, the 240 paper. Spend ages on this, as it will smooth all the little grooves you made in the frame with the drill. I cant stress enough how very important this part is!
4. Last bit. It still wont look very shiny, but oh my god, you will be amazed at what the wonderful Autosol can do! Put some on a clean, soft cloth, apply to your frame, and voila - you should be able to see your face in it. If you have spent as long as you should have (ALL DAY!) then the finish will be superb.
Thats about it. You dont need much of the Autosol, and whenever it gets marked with fingerprints etc, just use some to polish it up.
You can see the affects of the above in the Bike pics post. It's a dodgy picture but you get the idea!