Keep typing...it's good for those of us who want to help as we can determine where you are and get some insights on what's important to you.
When I purchased our current TV, which was to replace a 60" LED/DLP unit that was beginning to fail, I knew that time was not on my side. Like you, I knew the better half could not be without her TV. There was binge watching to do and movies to watch. I figured I'd just drop into the audio/video store, get some info, check out some units on display, decide on which TV to buy and make the necessary arrangements to have one delivered to the house. How freakin' naive that was...
I came out of the store with more questions than I had when I walked in. 4K, OLED vs. LED, HDR, refresh rate, SmartTV modules, size, HDMI version, etc....It was all whirling around in my head. And I left the store not having made a purchase decision. Clearly, there was more to it than I had first imagined. Luckily I had brought a notepad with me so I could write down some info. At that point it turned into a research project vs. a try and buy. Yup, a spreadsheet was involved with some basic info such as manufacturer name, size(s), selected evaluation specifications (more on that below) and price.
I decided to answer the size question first. I am a firm believer in bigger is better but you can go too big. After reading some articles about picking the right size, I realized that the informed writers of the articles weren't looking at TV's with my eyes. Some general guidelines stuck, however. I decided that the size of my room and distance from my seating position to my eyes meant 65" or larger would work. One question down, a few to go.
At the time I was in this process, OLED was emerging and, of course, the online reviewers and in-store sellers where hyping the heck out of it. After spending some more time viewing OLED and LED units side by side I decided OLED wasn't for me. It just looked weird from even the shallowest angles. And for some reason it looked as if the picture was curving upwards towards the corners, almost as if I was looking at some huge Cheshire cat grin. For some viewers, OLED works better and I say go for it if you like it. It was not to my liking and OLED was crossed off the list. So LED it was.
At this point I really began to dig into the specifications and features of the various brands. HDR, or high dynamic range, was a spec I found discussed across product lines so I figured it was a thing to consider. I realized that picture clarity was, in some ways, connected to HDR specifications. OK...it got added to my list of holes to dig into. Other specifications emerged as common across lines, such as refresh rate, HDMI versions, SmartTV functionality, edge lit vs. back lit screens, etc... This is where I began to drop down a rabbit hole. It was difficult for such an "anal"ytical (my wife's term) person such as myself to not dig further. But I managed to extricate myself just in time so as not to suffer paralysis by analysis and move on.
So, having managed to spend more time that I thought I would reviewing specs, I focused on refresh rate, HDR, size and what was emerging with respects to sources such as 4K, streaming and DVD/BluRay technology.
I decided on the first thing I listed above...size. I went bigger than I initially thought I would, overcoming some concerns about going too big by comparing sizes side by side in the store from the measured distance. Answer one = 70"
Answer two = LED for the reasons stated above.
Answer three through whatever = Highest refresh rate, best HDR rating, SmartTV without expensive modules that need upgrades, backlit for best clarity, current HDMI version, 4K to have that capability as the technology and new sources/media emerged along with the generous pixel specification 4K brings, highest streaming MBPS rate, and by picking the 4K spec the DVD/BluRay spec was covered.
You shoulda seen the spreadsheet.... LOL
So what did I buy? Sony's specs, reviews and functionality won the day and I purchased a 70XVR850B.
I also got one hell of a deal on that TV. It was a new model at the time but I balked at the price ($5,497) and told the sales guy during my second visit to the store that I was going to have to think about it and would probably go for something that wasn't as expensive even though it was the one I very much wanted. He called me a few hours later on that very same day and said he had an open box return available. His story was another buyer had purchased the identical unit and decided it was just too big. The buyer had them come over and pick it up, delivering a smaller unit in its place. He sold it to me at a "used" price with a full warranty and an extended service/warranty contract for less than half of the new price. Was his story true? Or was this a demo TV from the floor they decided to unload? I have no idea. But the TV is awesome and it's all I had hoped it would be.
I'm not saying you have to go through the same analytical exercise. But it will help if you can decide what's most important to you, find some basic info on those things and make your decision accordingly.
Good luck!