Thanks, guys!!!! I incubated at 99.5 fahrenheit and 50% humidity (roughly) until the last few days, at which point I got the humidity up to around 80% and couldn't get it higher. My hatch rate was 69%.
Everyone's experiences are different, and every duck hatching site has a different set of instructions, so I just did the best I could, and that worked decently for me.
I'm going to work on getting my hatch rates higher, but I also set some eggs that normally I wouldn't have (too porous, too small, etc.) because I only have two laying hens right now, so it was a struggle collecting enough eggs to make it worthwhile.
Good luck with the duck egg incubation. Lots of folks here can hold your hand, so don't be shy about posting questions!!