stereo instal

wow, what an outstanding post, i have gotten so much help from reading this. i'm driving a 1994 es300 with 64,000 miles, in mint comdition, which i'd like to not mess up. i currently have an eclipes head unit that i need to instal, along with a jl 500 watt amp which runs my 3 10'' jl subs, two focal door speakers, and 250 watt amp for the door speakers. i have two questions tho. how long did this instal take? and how did you remove the dash to take off the oem stereo?