Thanks dnalor and fokawe.
It's not that hard to do the greebling, just a very laborious process of cutting, cutting and more cutting... after that, it's just pasting them on. Not that difficult, just very tedious.
ops:
As for the round and ring greebles, I use a leather/wood punch to punch them out. I reckon you should be able to get them wherever you are - mine is a very basic and cheap set. As long as you keep them sharp (I only use them for paper modelling), they will serve their purpose well.
I bought these when I was in Tokyo earlier this year... served me well!