The Enterprise South CCW loop is a collection of three interconnected trails with increasing difficulty levels. It's also one of the most unique trails since the direction changes daily and could be clockwise or counterclockwise. As such, there's minimal risk of running into oncoming traffic once you start. However, you also don't get to choose your preferred direction. That said, depending on preference, you can time the days you hit the loop to coincide with one of the two directions.
If you're new to the area or are looking for a great start/end point, the large paved parking area is just the right fit since it gives you access to the trail system. Also, there's a changing station, so you don't have to drive all the way there in your biking gear. It's also a good idea to stop by the visitor center to get a map so you can see the lay of the land.
If not, ensure you have the MTB Project mobile app on your smartphone so it's easier to get your bearing at any point on the trail. Another thing you should do before you start for the day is asking for the day's direction so you don't run into fast oncoming traffic and cause an accident.
From this trailhead, you should head onto the easiest Black Forest trail first to psych yourself up for the rest. Ride to the paved road crossing and cross over to the TNT trail. While the difficulty of the TNT trail isn't a dramatic rise from that of the Black Forest trail, you shouldn't underestimate it. Be on the lookout for the rock gardens and some climbs that may be fairly taxing.
However, the first time you go through, you'll just be passing by to get to another road crossing. With it, you should cross and head into the Log Rhythm, which is a fairly difficult section with a long climb and some root crossings. You'll also come across some uphill rocks. That said, the technical part of this trail can be avoided by staying off the boardwalk.
Make sure you exit the Log Rhythm correctly for the day, and you should end up on the second section of the TNT. This route allows you to exit the TNT into a different section of the Black Forest which should dump you right back into the parking lot.
There are WWII ammunition storage bunkers, a roots tunnel, and the Tunnel of BOOM that might require a slight detour from the normal trail.