As for the tint: I just tinted my tails the other day, (OEM 98+) I used NiteShades, 3 coats. I didn't, however, cover the brake and turn lenses, because I don't have the $$ for tickets, or the time for court dates.
I just layed clear packing tape over the housings, then trimmed it at the lenses, and sprayed. Looks sorta like 94-97 tails, but without the amber turn lenses, and with tinted reverse lenses (I upgraded to a 50 watt bulb for the reverse lights - most autopart stores carry them, $2-3 each, they're designed for foglights, so they'll probably be in that section.)
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Edit:
They look something like this:
Re-Edit: Pics!
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As for going from clear to red - try Testors transparent red model tailight spray, then go over it with the NiteShades, right on the surface of the lense should be fine. Top it off with a few layers of clear coat, and it should look fine. Check the article section under 'Projects,' look for the 'Painting Taillights' thread for a pic of how it may look after just the red.
As for the swap, I did that while the lights were out, as well. For info on how to do this,
click me!