I workout at home, and I'm planning to get a pull up bar before I start stage 6. The problem is, I'm really having a hard time doing those dumbell pullovers in place of the lat pulldown. I can't see how they are working my lats as much as they are working my triceps. And, I can only load the dumbell to about 35 lbs. I feel that if I load it any heavier, I risk dropping it on my head, and that would just make a mess on the brand new carpet we put in our office

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So, I want to make sure I'm actually working the muscles that each exercise is intended to work. I read on here that you can use resistence bands on the pull up bar.
How would that work? What resistence bands do you buy? How do you tighten the resistence? Has anyone done it this way?
Thanks!