I can't set up any TV perfect even with $25000 in test gear.
So join the club. You can't.
Certainly not without test gear of some kind be it test discs or the whole compliment of hardware and software.
Please get a test disc and follow the instructions.
This article spells out what your options are ... now that you have figured out you don't like the picture on the TV.
1. Get test disc
2. Get hardware and software and learn yourself
3. Hire a professional
4. Get hardware and software and pay for professional level video training.