Blazer install problems - Please help

That hazard switch and shifter are a pain in the butt.  Hopefully you have the steering column that tilts?  If so, tilt it all that way down, and you might even need to put pressure on it because the spot where it will lock in to place is slightly higher than how far you can really push on it.

Just make sure you've removed all the screws--sometimes there's some on the bottom side of the trim as well, and the only way to get to them is to remove the underdash panel first.  Getting the top part to go over the hazard switch is the hardest part though.  It's okay to put pressure on it, sometimes you even have to bend it a lil bit.

I usually try to push down on the top part and pull out towards myself, and try to get that deep top section free first.  once you've gotten that it's just a matter of wiggling the bottom part out.  Also I usually end up putting the emergency brake on and shifting between park and 2nd depending on how far I've gotten the panel out.  usually i have to switch the shift lever a couple of times before I finally get the trim removed.