Most enthusiasts today look at the X-rite I1 Display Pro 3 ... (D3). It sells in the $250 to $300 range.
Of course that is just a piece of hardware and at retail, the software packed with it only works on computers ...
You will need additional software for non-computer tvs in the house just used to watch cable or movies ...and such. This can cost you anywhere from free to $300 for entry level stuff.
That said, software does not magically sprout arms and calibrate your TV for you. You have to learn all this yourself and it will take time ...
covers the basic thought process and your options once you decide that you want to do something about the pictures on the TV.
talks about the people that get mad when the hammer they buy does not teach them how to build a house too.
And this article
covers what you found out about copying settings from other people.
So now that you have decided that you want hardware and software, you need to weigh how much the cost of your time is worth to you. If it has little worth and you simply enjoy scrounging around on the web for tidbits of calibration information here and there, then get to it and it may take you a year to scrounge up enough information to get to a proper end result. But if you want to get to the end result faster ... then you have to start considering some level of professional training ... be it real live training or online training.