Custom WB should not be that difficult on the 7D; I assume it works the same as on my 5DmkII. Shoot a white object (paper, ceramic, ...) full frame in the particular lighting condition, then go to the WB function, select custom WB, select that image of the white surface, and that's it.
The only caveat is with paper/card-board and light sources with a significant UV component, such as electronic flash. Most white papers have UV brighteners in it, i.e., they fluoresce UV to blue, so a blue shift is noticeable.
I assume that you want to capture the color in a neutral, comparative fashion. In some instances, you may like a color shift. Typical example would be sunset, which is taken with daylight WB (5500-6500K), so that sun and sky look orange. Doing WB to say 2000-3000K, would make a perfectly white, slightly yellowish sunset.
Adjusting color balance in PS is not difficult and not guess work either. In curves, select the black eye-dropper (make sure that the eyedropper is set to 3x3 or 5x5 pixels, not single pixel in the options bar), select a very dark/black spot, click on the white eye-dropper, select a very bright area with just a tad of detail (i.e., not specular highlight). Then I like to go to each of the individual channels, and reduce the steepness of the curve by 10 units by using arrow key while shift key is held down, both in the heel and the shoulder of the curve. That can rescue pretty poor color. For more subtle adjustments including saturation, I switch from RGB to Lab and adjust a and b channels. That is more a subjective matter. For it to hold any water, though, a properly spider-profiled monitor is necessary.
In the RAW converter, you also have a color temperature slider, so that can get you quite far early on.
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Originally Posted by ronaldhanko
... As to the color settings, I don't have a color meter and don't know how to do custom white balance, ....
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