First one I remember making is a TOS P1, made out of Sculpey and modeled after the one in the Technical Manual. It was done at the scale shown in the TM, so it was somewhat oversized, and the emitter was far from screen-accurate (and it was a little lumpy); but hey, we all gotta start somewhere.
Later on, when I was in college, I bought a TOS communicator replica at a con. Which looked much better than my poor attempt at a phaser... and yet I still liked the phaser better, because it was something I'd made with my own hands. For all its faults, I was still proud of it.
Then a few years ago, I bought the John Long P1 replica kit. I was afraid my construction and painting skills weren't up to the task of making it yet, and to be honest the shape wasn't quite what I was expecting (I was used to the slightly more teardrop-shaped one in "The Making of Star Trek" that I'd pored over as a kid), so I made my own blank based on the TMOST photos (again out of Sculpey, but this time not so lumpy) and learned resin casting so I could practice assembling and painting until I felt I could put together the "real" one without wasting my money. After bad paint jobs on the first couple of tries, they actually started looking pretty good, enough that a couple of my Trekkie friends begged for copies, which I made for them. Then I got a 3D printer and modeled a couple of P1 variants, and now I have a nice little display of phasers on my wall... and I still haven't managed to put the actual kit together!
But that kit was what led me to really get into making prop replicas (even things that aren't phasers!) and striving for as much accuracy as I can manage.