One thing that surprised me when I went TV shopping a few years ago was that for me, bigger was not better. A big TV at a short viewing distance does extend across a large portion of one's visual field and can thus seem more impactful and immersive. But I discovered I do not like the immersive feeling.
So what I did was to figure the right size for me as follows: I went to Best Buy with my tape measure and found a, for sake of argument, 65" TV. I then moved closer and further away until the TV was the right size for me. I then measured the distance from me to the TV. Let's say it was 12 feet away where it looked the right size.
I then looked at my living room and measured from where I wanted to sit on my sofa to where I wanted the TV to be on the other wall. Let's say that was 10 feet of distance.
I then knew that the right size TV for me was 10 feet / 12 feet = X" / 65". Solving for X gave me 54" - a 54" TV at 10 feet would take up the same amount of visual space as a 65" TV at 12 feet.
I then had to decide between 1080p and 4K (*). What I noticed was that Best Buy strategically arranged stuff so when you were looking at 4K TV's, you were up close - like within 6 feet or so. I think they do that so you notice the improved clarity of 4K over 1080p, because it is noticeable up close.
I found a web tool somewhere and put in my visual acuity (20/20 to 20/25), the distance to my TV (that 10 foot measurement from before), and it basically said that I couldn't tell the difference between 1080p and 4K.
Since I mostly wanted to watch over-the-air network TV and Amazon Prime over my Internet connection, I knew most of what I was watching would be 1080p anyway. I thought that all the computer power and effort to scale and interpolate and whatever else goes on with a 4K TV would go to waste anyway visually.
So then I looked at brands. I liked Samsung and one other brand; the Samsung happened to have a cheaper model which was, I think, 55" or 59" or something like that.
I then checked out rtings.com (no "a" in the site name), which is a neutral TV reviewer. The Samsung I wanted had good marks, so that's what I bought.
The other thing I remember learning is that one "TV" brand was usually $50 to $100 cheaper than the others for the same specifications. Eventually I figured out that it was not a "TV" but a "monitor", which meant that you could not connect an antenna up to it and have it show TV channels like everyone is used to on a regular TV. A monitor could be used for DVDs, VHS tapes, and as a computer monitor, but it was missing something called a "TV tuner", which I gather is the part of the thing that takes in signals and can then change to channel 2, 3, 4, etc.
(*) 4K has higher resolution but at the time was twice as expensive.