Dear Bizi,
http://www.youtube.com/watch?v=sD-4E_woLz0 one minute video on how to cut it
I haven't made Spaghetti Squash lately. I can't remember how I cut it open. Probably now I would not try to cut it in half (I am a bit of a klutz with a knife. ) I'd probably poke holes in it like a potato and cut it in half after I cook it and cool it.
I'm glad that you are having fun with it.

M