It is not very difficult... so long as you don't live in a flat or can get out to somewhere you can make some smoke.
Here is how I normally make it. Small strips 1/2" by say 5" coiled up together in a boot polish tin. This batch is part-used. It would just fill the tin.
To complete such a large 'order' I just used a small coffee tin.
I packed a roll of cloth in the tin. It has to me a natural plant fibre. Cotton is good. I usually use toweling but I didn't have enough so I did one batch with that and one batch with the more usual 'flat' cotton (an old tee shirt in this case).
Once the magic blue smoke stops (or at least reduces significantly) then the tin comes off the heat and the hole in the top is plugged.
Then you wait until it cools. If you don't, there is a risk the whole lot could start burning when the lid comes off and the air gets in. I did find that using the taller tin meant that it charred properly at the bottom but not at the top. So I had to let it cool, tip out the bundle and then re-cook it the other way up.
I have tested both the tee shirt flat cloth and the towelling an both catch sparks. For my money the towelling is still better and will be what I continue to use.
So in summary:
- Flat tin - boot polish or sweetie tin.
- Hole in top
- Natural fibre such as cotton
- Cook till the smoke stops
- Plug hole and allow to cool
That's it really