I've been playing for 3 months and I think I'm okay, but there's been this one type of tab that's been bothering me.

How do you play the 4 and 3 part? Do you skip the two between real fast or what?

Any help would be really great.

(I just made up the tab it's not a real song)
you use the pick for the 3 and your finger for the 4 at the same time
mute them with, prolly your index finger. just use your index to fret the d-string on the 3rd fret, then let it rest lightly on the other strings below it, but with out fretting them. then use you middle finger on the 4th fret of the high e
no play them at the same time (either use your pick and ring finger or mute the other two strings)