If you believe Jesus and trust in His Atonement for the forgivness of your sins then you are prepared.
Every day is judgment day. You are being judged by friends, family, and strangers every day. Act like you should for today....if you are worried about something in the afterlife, you are wasting your time.
There isn't too much you can do. Repent, act kindly to others, maybe relinquish your material goods. But beyond that there probably isn't all too much.