If this is your first attempt at glow engines you might ask some hands on assistance by a club member.
These engines are quite powerfull and can bite you in a heartbeat.
With the assumption you're totally new to this, I write these pointers... Please don't be offended, I don't think you're stupid, but someimes a few basic advice can be good.

-Make sure the engine is bolted securly onto something rigid. If installed in a plane, teather the plane to something with a rope.
-A common mistake is to reach "through" the prop arc attempting to reach the needle setup.
-If you get the engine to crank, get behind it before revving it up and stay behind the prop, not infront of it.
-If the prop hits your hand, it wont take off your finger, but cut in to the bone and most likely give you a bad taste for glow engines.
-Use safety glasses. I once got a prop in my face and after that I always use 3M safety glasses when starting and adjusting engines.