Couple things: Most guys guiding snows in NJ are fully booked now. The real issue is every guide, at this time, is guiding south of I-195 north of the snow line. So areas like Hunterdon County and Warren are un-huntable at this point which have mostly private land, but can get extremely good. Time, now till mid/end of March. The birds right now are still hanging south due to the snow line. Southwestern NJ has them, DE and MD probably do as well. Right now, if at all possible, I would try to get a guide in DE.
For NJ, One Tree Outfitters is top notch in NJ.
In the future, try to book sometime in the summer or fall, as spots fill quick. My buddies and I usually try to book one hunt in February and one in March.
We've done the DIY thing with no success. Had a field in the promised-land in Warren/Hunterdon counties. We set up an 800 decoy spread and it was literally a drop in the bucket of what we needed to pull birds. We watched 10,000 birds pass over all day, giving one circle, and heading on to the roost.