I'm almost done with my defret. I didn't have the money for the Stewmac pullers (plus they were out of stock), so I tried my luck at the old flat-head and knife method, though I don't recommend it.
I gently banged the smallest flat-head screwdriver I could find under the fret ends to give a bit of leverage, then I worked my way along the side of the fret until I could lift one end entirely out of the slot. Then I slid the knife under the tang and pulled it across the fretboard which in turn pried the fret out evenly. The frets weren't glued in so it wasn't too bad (didn't need heat) and I got basically no tear-out. It was a bit of a pain, so next time I'm definitely getting the Stewmac pullers.
Epoxy is highly regarded. Depending on the poly, it can be good or not so good. Some dudes used two-pack poly with epoxy which is said to be good. Personally the easiest for a novice (like me) is CA glue. There's a few threads on it. It's quite easy to do, and solid as a rock once it's sanded and buffed.