The thing that helps me the most when dancing with beginners is to focus as intently as I can on my fundamental basics -- balance, carriage, alignment, energizing my core, using the floor, listening as carefully as I can to his body, maintaining my own sovereignty, keeping the clasped hands on the center line between our bodies, etc. Beginners rarely try any fancy patterns, and by focusing on my basics I find that it's easier for them to dance with me, and in a strange inside out way makes THEM dance better. I may not be able to read their bodies terribly well, or feel where they are, but they sure can tell where I'M placed, which in turn makes it easier for them to execute the little bit they've learned how to do. I'm not sure why it works, but when I'm doing everything I'm supposed to be doing correctly, my partner can't help but dance better.
I actually pride myself on being especially good with beginners. I guess it's my way of saying, "Thank you," for all those dozens and hundreds of men who so patiently and kindly danced number after number with me when I was just a stumbling and clueless beginner. And, it gives me a chance to practice my basics, which is difficult with a more advanced partner because then I'm having to field a lot of difficult moves that I may or may not have ever seen before and I find myself having to focus more on the "what" rather than the "how."
Interesting.