There is no one to review your performance - no one to scold you for a poor job or praise you for a good one. No one whose job it is to make sure you're motivated. No one, that is, but you. You must begin to fill all of those roles. Opportunity is one side of the coin.
Responsibility is the other.
Commitment is the key, discipline the tool. Establish good work habits from day one. A great way to begin is to pick a time that your office opens each day and be in it faithfully at that time. Treat your home and your office as two separate places that just happen to be in the same building. Don't mix activities between the two.