If the flowers appear too bunched up, try cutting them at different lengths for more variety. Don't worry if some blooms don't stay in exactly the right position at first. Continue to the process by adding more flowers, adjusting their height and position as you go. The stems should all fit comfortably in the neck of the container and begin to hold their positions better as more flowers are added.
Don't forget that not every bouquet has to be a masterpiece. The important thing is to have fun, experiment, and use your creativity. You'll find lots of inspiration in magazines, on web sites, and in nature. Just find some simple looks you like, and try duplicating them at home. Over time, you'll get more confident and creative, and who knows? You may find it's a great way to make very personalized gifts. So, pick up some flowers today, and make a beautiful bouquet. You might discover a talent that's ready to bloom in you.