Thank you for your kind words.

I used fiebings pro dye, and to apply it I just cut a kitchen sponge into bits and dipped them into the dye. Then I applied in circular motion, and damped again with dye on the areas that I wanted darker.

Also I nourished the leather with neastfoot oil prior to dyeing, I find that is helps getting a smoother, more homogeneous result.

I suggest giving it a try on some scraps before giving it a go on a nice project. You can also use isopropil alcohol to dilute the dye it you want a lighter shade.