We're currently practicing using the spoon too, so I understand what you mean.
I didn't just give DD the spoon and let her try it on her own. I started out by loading the spoon for her, then holding it out for her to grab the handle, while I still have my hand on the spoon to help support/guide it towards her mouth.
We gradually changed to me loading the spoon and letting her handle the spoon on her own without my hand helping to hold it steady or guiding it towards her mouth. Of course, I only do this with less messy foods (cubes of waffle/pancakes, cubes of yams, etc). We're not ready to try it with the messy foods (spaghetti in sauce, yogurt, etc). I praise her when she successfully gets the spoon and food into her mouth. And she feels so good about getting the food in her mouth that smiles (& makes a happy sound), holds the spoon up and waves it around in victory.
She's also a quick study, motivated by her desire to eat.
Sometime in the future we will practice getting her to load up her own spoon herself...