.-. You kick/punch him in the correct spot on the joint so that it dms. If the dismemberment threshold is high, it means it's harder to dm uke. If it's low it means it's easier to. Dming takes practice to do easily.
make sure the action you are doing to uke is so fast like sonic, they wont see that they got dm'd
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ez life
You'll find that some mods have higher DM thresholds than others, judo has a low DM threshold so it will be easier to DM, but aikido and all it's variants have high DM.
If you want experience in dm's, do judo or mushu
If you want experience in dm's, do judo or mushu
oxisudofrenohypoglycemolicodin
A good way to practice dming people is to do either taekkyon or try out SINGLEPLAYER and finding the good spots that they break easily in. Re playmakers probably know a lot more than i do. Watch some replays you can find some in the Replay thread and look how they get there DMs. I hope i helped. 
w