This is liable to get moved to the Audio forum, but....
The install is pretty dang simple. The dash cover just snaps off (be careful, tho, you can break the tabs pretty easily) then it'* just three screws....
Trying to mount an aftermarket stereo flush to the dash involves a little trimming inside the dash, but it can easily be done.
Less that one hour or one beer for the whole job....
The speakers will depend on how they were treated previously and what you are expecting out of them. My stockers get pretty dang loud without distorting, but I'm old. Loud to me and loud to the younger crowd have varying definitions.
1998 SE Midnight Blue Pearl
Gutted airbox, FRAM AirHog, removed MAF Screen, eBay clear corners, extended brake lights
I'm so much cooler online