Cut the thread on a very sharp angle and slide it through the eye. Pass the needle through the thread.
Pull the thread to tighten up on the eye of the needle.
When you’re finished it will look like this and will stay very tight.
The Best Way to Thread a Needle
Learn the 2 needle SADDLE STITCH, It is the best as it’s extremely strong and if worn or broken will never unravel. Approximately determine the length of your stitch and use 4 times that length ( Example: if your around a wallet is 16 inches then cut a 64 inch length of thread and put needles on both ends.
Use this as a guide for buying the right leather for your project.