Welcome to DV.

Well, I think your main obstacle is that you're getting too excited.
When you're excited, your pulse goes up and adrenaline is released, this causes you to either lose lucidity, or just wake up.
The absolute first think you need to do is A) take a few deep breaths to calm yourself., then B) stabalize your dream, (here's a nice thread listing a few that work best for people http://www.dreamviews.com/f14/what-s...rk-you-108360/ )
And if you're a beginer, start with small stuff then work your way up.
I hope this helped. ^__^