This workout is all about active recovery! Your starting 800m and ending 800m should be at very similar paces. While you will naturally feel more fatigued on the second 800m after your brief hill repeats (and of course the first 800m), you should aim for consistency. If your second 800m is significantly slower; dial back your pace for set #2. If it feels too easy then push yourself a little harder on the finishing 800 of each set.
At Newton Middle School, we used a very short hill for the repeats so don’t feel obligated to go too crazy. You can walk up stairs/bleachers instead if you don’t have a hill nearby. If you really don’t have a short hill or anything, then run a nice and slow 200m in between your 800’s.