You say you want to "get it tinted," which I assume means that a professional will do it. If I'm wrong and you're planning to do it yourself, the most important thing I discovered in doing it myself on the leather of my '83 SC, changing it from tan to black, was that the leather paint (which is what it really is) should be sprayed, not brushed on.
As for prepping the leather for "tinting," you need to remove as much as possible of the leather's existing paint, and you do that by literally sanding it off, albeit sort of gently. Soften the finish with quck-drying lacquer thinner and then work on it with whatever feels best to you--Scotchbrite, steel wool, ordinary sandpaper--and then hit it with more lacquer thinner and keep going through the cycle until you have most of it off. You want to sand hard enough to give the leather a slightly suede-like finish but no harder.
Stephan
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