What are the best settings for making a 52 samsung ln t407 clearer?

Unfortunately this is dependent on your specific TV and room. Your best bet would be:

1. Hire someone to adjust your TV. You spent a lot of money, is it worth another $100 to get a great picture?

2. Buy a good DVD that helps you set it. I went that route to save money but a professional would have done better. I also screwed it up for awhile, don't know why, and I am very technical.

3. Buy the equipment, do it yourself, then start a side business doing it for others. You may need to invest in training.