Here is a video on repairing a small cut in your leather. You should only attempt this repair on protected leather. (See the knowing your leather article) You will need just a few easy tools that you probably already have around your house:
A soft, white cloth for cleaning, a small piece of thin, strong cloth as sub-patch material (cut an old t-shirt so the edges are not too frayed or get a piece of sub-patch cloth at the fabric store) , scissors, a paint brush w/ a round bottom, Aileens craft glue (Liquid stitch or Unique Stitch from a fabric store will do), a dull paring knife, a straight pin, a hair dryer, a heavy book.
Now just watch the video a few times through and give the repairs a try.
Even if you don’t find you can do the repair, your attempt will not damage anything. You can always hire a leather professional to do the work for you.
When you complete these steps, you will have a solidly repaired tear that should not reopen or tear further.You will still see a line at the top where the cut was before you repaired it. If you want a repair that looks more finished off, a leather professional can fill the line, recolor the area and clear-coat protect it. You can check our service professionals section for the name of a good professional to hire.
Let me know how the process goes for you. You can even send me before/after pictures to firstname.lastname@example.org and I’d be happy to post them so you can show off your new leather repair skills.