First off remove all the parts needed to get down to the frame alone including the cups on the head tube, using a flat head and hammer will do the job. then place the frame in a vice and get to work at sawing of the down-tube and seat stays. When cutting try and get as close to frame as possible to cut down on the amount you will have to file down at a later point. Also if there are any cable guides on the frame now would be a good time to cut them off as well.
Step 2: Getting rid of the paint
This step can be fairly time consuming. I should have used a paint stripper of sort but I didn't think of it at the time, silly me. it is important to get the frame as shiny as possible for the best look possible. I decided to try and speed things up with a belt sander which worked very well, ideally I would have like to use a sandblaster but wasn't able to. After using the belt sander I had got rid of the majority of paint but I still needed to get the hard to reach spots with sand paper and files. Over all I like how the metal had a scratched effect. After you have removed all the paint you can I would advise you to use a clear lacquer Finnish on the frame to prevent rust in the future.