From your description, it sounds like the engine is o.k.(?)

The factory recommended needle valve settings are quite rich (usually ) and there could be excess fuel building up in the crankcase as well...you could be experiencing a partial "liquid lock" so if that happens, just tip the vehicle on it's side w/ the exh. stack pointing down and slowly pull it over (carefully, because you can break the recoil if you pull too hard ) to drain the excess fuel out.
If you see a bunch of liquid fuel dripping out of the pipe, then that's what's happening (more than likely )
If you get a lot of raw fuel down inside the engine, it will be easier to un-flood it by taking the plug out and then pull it over several times as above.
As you get a little run time on the engine, and get it adjusted properly, it will get easier to start.

It also helps if you have a really good glow plug battery...one that makes the plug glow bright orange.