That's really great advice.
Don't be surprised, though, if you don't do as well as you'd like on your first few practice tests, since you've been out of school for a while. It can be a shock to the system, let me tell you!
I agree that studying and doing practice questions before taking a full test is a great way to start. The PR book is really good, and they also have an Analytical Workout book that will help with the games section. Also do a real LSAT or two to help gauge your progress (you can buy old LSATs from LSAC -get the more recent ones, they're harder). When you do your first practice test, whether it's the PR tests or the LSAC tests, do it untimed so you're not pressuring yourself. Just get comfortable with it. Then do a timed one. There are lots of practice tests out there, so it's unlikely you'd run out!
I disagree that courses in general are a waste of money. The LSAT is definitely a killer and it's a test you can master. Even people who score well can get an extra 7 points or so out of a class, and as you do your research, you'll see that 7 points, and sometimes even 5, can make a big difference - not just in your acceptance rates, but in scholarship money. The course might cost a grand up front, but can save you thousands down the road if the higher score gets you that scholarship.
One last thing - don't take the real LSAT until you are solidly prepared. Most schools average your scores, so if you don't do well and retake, a low first attempt can still hurt you. There's a bunch of info about law school admissions on review.com, 4lawschool.com and nontradlaw.com, besides here, of course!