Lack of a precise visual aiming point does make it tougher to be consistent when trying to hit on either side of the ding line, but after trying the misding (off-ding) method I've found out that you don't need to be as precise.
I just started trying out this method, and after about 15-20 practice holes, I played the front 9 of Best of Par 5 Holes and scored two strokes lower than my previous best. Played a couple of 18 hole rounds of PGA National after that and wasn't as successful, but my scores were in the range of what I usually do on that course. I'm encouraged that I did as well as I did with so little experience with this style of play. I think I'm going to have more balls rolling toward the hole after they land than away from it. I got an eagle during the practice holes because of that and an eagle on the Best of Par 5 round because of that.
I switched to off-ding putting not too long ago and discovered that I need a slower meter for that because of the lack of a ding line to aim for. I switched from a 4.5 meter putter to a 5.0 meter putter. Slower balls make off-ding putting easier, too, but (for the most part) I'm still using 0.0 meter balls. I'm sure slowing down the meter will make misdinging with the other clubs more consistent. I'm looking forward to experimenting with that.