OK, I have a problem with Lightroom that is entirely due to my own incompetence. I have a few images that are overexposed in spots, but I sometimes reach the end of the Highlight slide bar before I reach the adjustment that I need. This happens mostly in portraits where I've thrown a bit too much light onto a person's face. I know the detail is there (no blinkies), but it doesn't appear that the slide bars are set to adjust over the entire range. I could probably do what I need in Photoshop but I really suck at Photoshop so I'd rather stay within Lightroom if possible. I've tried selecting the region in question using the adjustment brush and playing with the exposure slider there, but I seem to get more artifacts using that approach than I do with the Highlight slider.
So, how does one deal with exposure adjustments that go beyond the slider range?