I've done both my Concordes. Just keep putting one foot in front of the other until done. I recommend the OEM evap. simply because they don't play games with leaving out important functional details and you know it will be plug-n-play. Be sure to get the OEM HVAC reseal kit. I forget if you have to buy it separately or it comes with the evap. - better ask. They've done away with the foam drip tray - probably a good idea - it generally rots anyway.
When you think the dash cover is ready to lift out, if it feels like something is holding it in place, then it is - there's at least one more fastener still needing to be removed. When all fasteners have been removed, it will come off with little effort - lift up while simultaneously rolling it to the rear (up and over the reinforcement bar).
My biggest fear was punching a hole in the dashboard cover with the shifter while lifting it out. My wife came up with the idea of putting a blanket under the cover while lifting it off - one person at passenger door, the other at driver's door. It's not that heavy, just long and therefore awkward. Agree which side it's coming out, then one person backs away from the door opening, the other crawls into the car on the other side onto the seat. By the time it's 1/3 to half way out the one side, the person on that side can pretty much lift the whole thing and walk it totally out - again, it's not very heavy. The helper needs to grab one end when you're ready to set it down. Of course have a clear area prepared to set it on - maybe covered with another blanket.
'98 LXi - Later Concorde gages (black w/ chrome rings)/'99 LX - LHS gages (white) - HIR bulbs