I have heard you are suppose to mute will you sweep, which is very dificult. What I do is mute the open strings with my picking hand as I go down. Now when I go up is the hard part. It is impossible to mute with the right hand, for me. So I use my left hand to mute the open strings as I go up. It seems to work well, but is this the right technique? Any advice would be extremely appreciated.
As long as it

A) Does the job
B) Isn't harmful to your hands/wrists

Then it's the right technique.
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