I think it would be best to start from the bottom trail head and hike your way up. The Point Rock trail is a 2 mile out and back, so you are looking at a four mile round trip. There are two reasons why I say to hike from the bottom up. Number one is because you will get to the top and be surprised with an awesome view from the overlook. Number two you will want to have most of your energy for the hike uphill. The trail basically goes from the bottom of the canyon to the top. From what I hear the Point Rock overlook is 800ft above the bottom of the canyon. Be sure to follow the orange blazes on the trees that mark the trail. Also, near the top of the trail, just before you reach the end, you may be able to hear a small waterfall (which may be seasonal). You will see a short trail veering off the main trail that will take you to it. You may want to hike this one in the winter due to the fact it is very grown up in a few places. If you hike it in the summer just wear long pants.
Note: There are other trails you may want to check out while you are there.

Scenery:

At the top of the trail you will reach the Point Rock overlook and get a great view of the canyon from 800ft above. You will also see a small waterfall and rock formations along your hike.

Trail Maintenance:

The trail is grown up in a few sections, but it is marked well so it's easy to navigate.

Facilities:

There are some restrooms at the Point Rock overlook trail head. I also suggest you check out the Grove Oak Store located near the park. Another added bonus to Bucks Pocket is that it is located near Lake Guntersville State Park. You may also be interested in checking out the High Falls Park in Grove Oak. High Falls is a tall, scenic waterfall. The owners of the Grove Oak Store can give you a brochure and tell you how to get there.