My first Trek novel was Encounter at Farpoint. I received it for Christmas, 1987. I watched the episode when it was first on; and in December I watched the first half again, twice. But, when the second half was on, campus was closed, and I was home with my parents, who didn't receive that channel, or any other that had TNG. So, I never got to watch the second half until years later.
That said, while reading the novel, I started to realize "Hey! This is the first episode!". Because I had recently watched the first half twice, while reading the first half I could easily remember and picture the scenes. However, the second half was a lot more difficult--I couldn't remember scenes from when it was first on.
After that, I read a limited number of TNG novels, but I had a very difficult time recognizing which episodes they corresponded to. It wasn't until years later that I realized that Encounter at Farpoint was the exception and not the rule.
Since getting back into ST, both watching it and reading it, my first novel was Spock's World.