Hi Fear.. my tip for initial settings for low idle:

1. Screw it in all the way, but do so gently. Once you feel resistance from closing, stop.
2. Attach a piece of fuel tubing to the carby fuel inlet and apply air pressure to it. You know how to do that don't you? Just put it between your lips and blow. Ummm... had a Marilyn moment there, sorry. Anyways...
3. Slowly turn out the low idle needle until you hear/feel air escaping past it. Screw it out a little further just to make sure it's set a little rich.

This should give you a reasonable starting point, and at least allow the engine to idle, albeit it at a rich setting.

Initial setting for high speed needle should be 3-4 turns out. Again, this will ensure it's nice and rich and will allow you to tune it in.

With regards to fine tuning once you have it running, search the forums for process.. there are a few approaches you will turn up, all claiming to be the best way. Do what I did.. try one and see how it goes. If it doesn't work, give the next method a try, etc... you'll get there in the end! At the end of the day, it's all about a steady idle and a smooth transition from low to high RPM.

FYI, I am a fan of the old "pinch test" for low idle settings, and a "-200 rpm rich" method for high speed settings.

Hope this helps!