Yeah, but...
... it takes a little bit of skill to do that. That's not to say one cannot do it themselves, but you should probably familiarize yourself with what video options the TV offers for adjusting the picture first. You'll need to know these when using a disc.
In fact, with a little common sense and careful adjustments to these, I'll bet you can probably make a fairly significant improvement by using them alone.
Spend a little time with the manual.