Q: For my 21st birthday, I want a 50's hair-do that I can do myself. Do you have any suggestions? If you can reply that would be great!
One of the most common hairstyles emulated for a "50s" look among young women is the "pulled back ponytail with bangs" look, which is great for you if you have long and/or straighter hair. Keep in mind that the "50s ponytail" was centered in the back of the head usually at eye level (but in the back, obviously).
Another of the most common styles was a circle cut with a roller set and styled with some height into a "bouffant" style. Be sure to wrap the hair so that the rollers have full on-base placement for maximum volume. Once the hair has dried, you can comb out the roller set and back comb the hair at the top and crown to make sure to have maximum height.
Fortunately you don't actually have to use rollers any more. You can use your curling iron to create the barrel curls needed to form the base of your hairstyle.
For more ideas, you might try scanning some popular older films of the period, or television shows that were set in that era such as "Happy Days"and "Laverne and Shirley" come to mind and can usually be found in syndication in many places around the globe.
Hairstyles of the fifties
The best hairstyles for your face shape
Techniques to style your hair with rollers