It takes a lot of practice! A lot of it...I'm still working on my techniques actualy...But if your stiches aren't the same length, it can be your spead..or you pulling the fabric at the wrong times, or it could be your tension on your threat..make sure you check that also. My machine has automatic tension adjustment..but it also tends to change the length of my stiches in the middle of sewing ( Very annoying ) Keep your speed and movements as fluient as possible. adjust stich length if needed, and adjust tension if needed.,...Hope that helps..you really just need to play with it till your comfortable.