Black and red are both difficult colors to remove. I've had to strip out both in the past 12 months and... wow. the black is hard to lift, as the pigments are so dark and there's so much pigment density that it takes forever to break the pigment molecules down. However, I've had a lot of luck with dye removers, especially Color Zap. When my hair was black, I applied Color Zap and, by the time I was finished with the back of my hair, the front was already lifting nicely. In 30 minutes, it was already at the orange stage. Not too shabby, considering the color I was lifting.
Red... red is my haircolor nemesis, in a lot of ways. Once it's in the hair, it's extremely hard to remove and most people have to settle for neutralizing it or risk killing the cuticle to get it out. I don't recommend killing the cuticle. BAD news. However, I just recently went from level 2 red brown to level 7 neutral blonde, so it's completely possible. It took a lot of color remover, bleach and tons of violet pigment to do it. If you decide to change colors after going very red or very dark, I strongly suggest the use of a color remover. They're designed to remove artificial pigments and will do so very well, often with a lot less damage than bleach.
Also, if your hair is already porous, a demi permanent dye might be a good idea for the first application. In my experience, it sticks to the hair very well and will last for quite a while. If you decide that you hate it, demi-permanent colors are much easier to remove. If you fall in love with the new color, you can always go over it with a permanent dye. Personally, I love demi colors. It's like playing dress up with my hair :)
At this point, you might be well served going to a stylist for a color consultation, even if you intend on doing the color yourself. He/ she can look at your hair and take your natural/ current color and condition into account. You likely won't get a formula, but you can get a good idea of how hard the colors would be to remove and ideas for what base colors you'll want to use. I also second the idea of trying on wigs. It's fun and you'll get a very good idea of what colors you like.
Best of luck with this. Doing a drastic change can be very stressful and I hope that you love your hair, no matter what color you decide on.
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