Just did this repair yesterday and yes it's a total PIA. As far as the snap, you have to press it down to release it while either prying or pulling the fuse panel straight out from the kick panel. I used a flat head screw driver to push it out while pressing the snap down. Here's the thing though, I removed the panel below the steering wheel then unbolted and removed the metal panel behind that, the one that holds the speaker. I then removed the ducts for the heater. Next i unplugged all of the connectors going to the fuse panel then the security ecu. Now the panel should come out.
Oh yeah, all of the paces that hold the wiring harnesses and/or plugs are removable for the fuse panel too, helps in getting access the the antenna motor. Hope this helps.
91' MX6 DX with MS2 DIYPNP ECU, Garret TBO-335, SCG-1, 2.5" exhaust, Tial Sport MV-S 38mm WG, no cat, etc. Bosch 4-hole injectors, 2.5" Aluminum intake piping, 25"x19"x3" intercooler, ACT St Perf HD PP and Disc, AEM X-series Wideband, AEM water Methanol Injection, 17" MB Alpina Black Wheels, 225/45 GT Road Hugger Ultras, '06 Mazda 6 Front Brakes, '93 Probe rear calipers on '89 Probe discs, GT Head/fog lights, Hikari LED lamps, Logic AC/Heat controls, Clifford alarm and remote start