Use your palm to mute any strings under the one you're pulling off from, and use your other fret fingers to mute off the higher strings.
adjust your fretting hands posture. Keep hand up and fingers in a position where they are flexible. You'll get it eventually. Just adjust a few things.
Hold the strings down with ur right hand on the neck somewhere above the note your fretting...
Fender 70s Ri Strats w/various Dimarzios
Modded 1982 Marshall JCM800 2203

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