I just completed this course in October. I started in June and finished my clinical hours (84) around Halloween and have secured a staff position after 10 years of inactive status.
Your apprehension is understandable--I felt the same way. You will find the staff at Austin Comm. College to be very supportive of your efforts. They welcome questions and even schedule conference calls. They also offer 2 skills weekends at the college (2 consecutive Saturdays) which are not required but I found extremely valuable. The online diadactic portion of the course is interesting but does take a lot of time especially trying to get all the textbook reading done. Your instructors will give you lots of tips so you don't have to read entire chapters.
There is a medication calculations test you will have to pass but don't let it discourage you. It is basic math and there a lots of links to helpful sites. We also were partnered up online with another learner to complete care plans and other critical thinking activities.
Best of luck to you and I know it will be worthwhile. Just be determined and disciplined with your time.