Last but not least is maintenance. Let's start with how to keep these sideburns even. My famous "pointer finger" test works flawlessly every time! Take both index fingers and place them at the bottom of your left and right sideburn. Have a look in the mirror, and take notice of which finger is higher on the side of your face than the other. If you like the length of the higher one, trim the longer one a little at a time (while continuing to use the "pointer finger" test) until it's even with the other.
The easiest way to keep them under control (no matter the shape or size), is with a pair of trimmers. These will not only let you create, but also maintain your desired length. Because sideburns can be a combination of beard hair and head hair, consider trimming them every 2-3 days.
To keep them close, start with the highest number guard and work your way down the numbers to get the desired length, trimming up (jaw to temple) to remove the most bulk. To keep the bulk and remove the stray hairs, trim downward (temple to jawline), which also gives a smoother appearance.