Allow yourself to be ambitious, adventurous and enthusiastic. You won't find out how much you are capable of unless you try. If you do try and, despite your very best efforts, you run into some insurmountable obstacle, you will still gain from making the attempt.  You will shift something. You will open at least one locked door. That, in itself, will constitute highly worthwhile progress. And it will mean that your next attempt is far more likely to succeed. Just keep going.