The thing with leaner Legs is that the max weight cathe uses is a 35 pound barbell. She uses 8 and 10 pound dumbells for other exercises. That is light ("ish" depending upon your perspective!). The thing to do is to gauge how to complete the entire workout so that by the end your legs are wobbling through that last exercise, shaking with the effort. But you don't want to experience this right at the beginning, this would be reaching fatigue or even failure too early. So, you may want to start out with a 25 pound barbell and 8 pound dumbells, see how this makes you feel throughout and by the end. Then graduate up to the 35 pound barbell. I know when I start back after a break from exercise, I usually choose LL to get my legs cracking again and I use the 30 pound barbell. It produces a solid workout, believe me. So.....
Also, I believe GS legs would suit you because the only exercise that uses a heavier weight is the 3 sets of squats with which Cathe starts out the workout. So, you could just use a 30 pound barbell for these. The rest of the workout uses 8 and 5 pound dumbells. I go higher, but the point is that you don't have to. In this workout Cathe uses a high degree of pulses to fatigue the muscles, and the floor work in the second half is stability ball and the dynaband, endurance work at its best. So, I think GS legs would be excellent for you. I know I love it and there's no muscle of the lower body left unworked with this one.
Good luck Tall Chick. How tall are you by the way?
Clare