Bobs got a point about the gloves... though 75% of the time I forget to get em out and get dye all over my hands... LOL
If you are going to be working with Veg Tan leather and not building saddles, then I suggest you dye in pieces. I just did a case for my blackberry: http://leatherworker.net/forum/index.php?s...amp;#entry21738
As you can see from this thread, i made it cut it all out and then dyed it then painted it...
I was actually going to leave it natural, but the tools left discoloration where I stamped the larger stars and I was not happy with it, so I dyed it, then decided to add a little life to the color and did the stars to stand out so it would not be just black...
Normally, to make it easier and to get an even overall dye job, I would have dyed and painted before I assembled it. Dying after it was assembled gives the obsticals of the rivets (having to wipe them down after they dye gets on them) and the clip (again having to wipe it down) and then applying the finish has the same problems... Not to mention the edging.... I could not properly apply the edge coat once it was assembled and if it was not all black on black, you would be able to see the major flaws in my edge coat work....
So... it just depends on what you are doing and if it has hardware or not....
Con against dying the whole side of leather is.... what is you want to make something from it that you DO NOT want to be the same color?
Not sure about tooling pre-dyed veg tan.... anyone do this?