Get some #40 sandpaper and a piece of 2X4 as a block and sand them (both sides). This is not rocket science or hard to do at all - Hold the block on the rotor and turn the wheel. With the wheel off to swap the pads anyway, it will only add 10 min. to the job.
Pads bed-in partly by depositing a layer of material on the rotor and the interaction of this layer with the pad creates the most efficient braking.
Different material from different pads are not usually compatible or consistent with the most efficient braking. This is why you want to sand the rotors - to remove the old material, so a good layer of the new material can be laid down.
Cheers!
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