EDIT: I forgot to add that I misted the plants twice a day with extremely diluted Flourish Excel. That kept them very health. I left town for a few days and came back to not quite so happy plants...they yellowed up a little. I would definitely recommend keeping it misted.
I did a DS with microsword. It grew a little, but it is slower than the DHG. I only wanted a few clusters around the base of my rocks (it's a very small 6.6 G), so I just chopped up a package from the LFS into four tufts and tucked it into my substrate.
It has been just shy of a month and I flooded my tank on Sunday. It was too soon, but I trimmed my dwarf hairgrass to promote runners, and it was hard to clean up the trimmings, so I flooded the tank to make them float up. My CO2 in not in place, as I was expectiing to flood in a week or two out.
I have Osmocote under my Flourite substrate to feed the roots, and I am dosing Flourish Excel, Flourish Micros, and a little dry ferts. I'm doing daily 70% water changes this first week. I have medium to medium-high light in the center of the tank with some light fall-off on the edges.
I'm happy with the DSM so far, and I hope the algae won't go crazy on me until I can get some CO2 in place. I'm hoping the Excel will help, as well.
I'm looking forward to seeing your tank progress. Your rocks are much better scaled for microsword and DHG than my tank. Classic newbie mistake on my part.

Good luck!