Yeah, I've setup a few times only to realize it's too low for me to get out of easily. Deep squats after a long day of hiking: not fun. Definitely try to get it to a normal chair height then you can walk back with your feet and it pretty much dumps you right out.

When set up too low; getting your feet under you, pushing off the edge of the hammock with one hand while pulling up by the ridgeline with the other is pretty much your only shot. The closer you can get those three points in a vertical line, the easier it gets.