It makes total sense to feel that way. Taking a new medication can be really intimidating, even if it’s something a lot of people use without issues. Your plan to take the first dose at home when you don’t have anything going on is really smart — that way you can ease into it and see how your body reacts without any pressure.
Most people do just get sleepy or relaxed, but being nervous doesn’t mean anything is wrong — it just means you care about how you feel. Once you try it, you’ll probably find it’s not nearly as intense or “weird” as your mind is imagining. You’ve got this, and it’s okay to take it at your own pace.