Yeah, I wasn;t really too careful with my clones either... and I also took some about 3 weeks into flower as well, they did take longer to root than the first batch though.

All I did was snip them off with regular garden sheers (very sharp ones), i dropped them in a cup of regular water for a couple minutes.

then i cut off the extra stem using a diagonal cut, dripped in rooting horme (shultz powdery stuff), made a pencil sized hole in the soil about 1/2 - 1" deep, stuck the cutting in the soil and packed dirt up around the stem.

i did find the humidity domes did alot for me though... mine got really really droopy without them