DME will clump together, but won't scorch. LME is much easier to add to the boil, but it can scorch & harden on your kettle. It's just a personal preference on which to use. You'll get the same results.
Have a stirring spoon in one hand & your bag of DME in the other. Slowly pour the DME in while stirring because it will clump together if you add too much at once. In my experiences, leaving it on or off the burner didn't make much of a difference on reducing clumping if you're already at a boil.
+1 on adding half at the end of the boil if you're looking for a lighter color.
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