Eight years ago, we started out just like you -- really worried about cutting the cord. After a season of RV park camping, we tried a couple of days at a regular campground without hookups -- it went well, but we realized we needed a bigger battery (our original one was very small -- a group 24). I knew nothing about batteries.
We got a bigger one -- group 27. We tried a longer weekend -- I realized we needed two batteries, mounted side by side. That worked well. We tried a few days without hookups. No problem, and very pleasant. I figured out when it was time to switch out the batteries.
Later still, I got a generator (which we almost never use -- it is mostly a "just in case" thing). I got even bigger batteries -- group 31, with 110 amp hours each. I had no idea what an amp was, let alone an amp hour. I learned, slowly.
I eventually changed out our light bulbs from incandescent to LED. Much less power draw.
We started "boondocking" for short periods of time, where you are not even in a campground. This is allowed in many national forests.
Eventually, boondocking became our preferred method of camping -- we are all alone, many miles from anyone else, in our own private forest. This is what it looks like -- you have to imagine the silence and the peace:

Bottom line -- don't jump into extreme boondocking right away. Take baby steps. Experiment. Learn how to live without hookups -- it is easier than you think. And come on over to the boondocking forum and start asking questions -- you will find that we are very eager to help out the newbies!