OK first of all, these leves are very very easy. However, most likely they will get redesigned soon, as with other leves.

A few tips:
Line of sight, mobs will detect you by LoS, so just hide behind Wall, Rock, Tree etc.
When they stop and stand still, that's your cue to hide. They will very soon turn back 180 degree and run very quick.
You need to make sure you are within the circle are on the mini map (or highlighted area), just like when you follow your Companion during Story Mission Quest.
The target will generally make a quick turn back, run very fast for quite long duration at the end. When it happens, just run after them ASAP and forget all about hiding.

This is much easier than playing Stealth on say TES or FO, which are still easy as cake compare to MSG.