Just make sure you get the correct gas pedal for DSG as it has a kick down option where as manuals dont, basically the pedal goes down to almost the floor & hits a sprung loaded plastic cap under the pedal which is green on mine that you can see if you look closely with a torch, if you push harder it of course depresses the cap & pedal goes furthest down & makes the car kick down a gear, I think thats a fair way to explain it, lol.
Swapping over is fairly easy, just take the upper bolt cover of, unbolt, then at the botton hidden there's 2 horizonal gaps on the front of the pedal about 5-8mm wide you have to look carefully maybe slightly prize the pedal up, then stick a thin screwdriver in & push in & then inside hidden are a clip that you have to push in on one & the other you push to the side from what I remember when I did mine, there's a cable plug at top rear, of pedal, depress the white clip & it releases the plug to pull of the pedal, when replacing with new pedal just push plug back in place, then push the pedal down at front as clicks back in & then bolt in place at top & replace cover.