Trying to dye for the first time

Hello!

I hope this qualifies. So, I want to dye the leather on the exterior of this wallet but don’t want to change the color at all or bleed on to the picture bit. I believe it’s raised enough that if I prep off the varnish/seal/whatever it should be ok but I just wondered if anyone had any tips. I included a picture of the wallet and the products I currently have. Thanks in advance!