What you hear about BuSpar is that it did poorly in clinical trials so it isn't anecdotal evidence in this case, it's the actual evidence. But individuals respond differently. It's entirely possible that quite a lot of success with meds is placebo given that none of them have done all that much better in trials than placebo did, but still, when a drug doesn't even pass this test you hear about it. Only time will tell if it helps you or not -- my understanding is the only remaining wide use of this drug is as an adjunct to an antidepressant, but again, you're the only you and if it works for you then great. For the details of how to use it, your prescribing doc should have put that on the label of your prescription. Psychiatrists are better at this usually because they deal with these drugs all day long and put in extra time to learn them, which general docs didn't do. You can also go on the website of the manufacturer, read the long insert that came with your first prescription, or ask your pharmacist.
You need to read the package insert for any med because it explains how to take it.
Anecdotal evidence is valueless, since lots of people take anxiety medication but would benefit from therapy, so they might think it was the greatest med because they stopped being anxious. However they might have just recovered from anxiety due to a therapist counseling them, or they didn't have real anxiety and just stopped worrying but thought they got a miracle cure from the med. I know someone who has been on anti-anxiety meds for 5 years who thought he got a miracle cure after 1 day, but his doctor keeps him on it otherwise he willtake up the doctor's time.