I think its pretty easy to take out, it took me 1 hour to get everything put together without instructions, just figuring it out as i went. the second time i did it for a friend, it took about 30 min.
There are dash kits, and you can either go that route, such as crutchfield's xterra kit. or you can try to put one together yourself, which is what i did. i just bought a double din pocket and worked it together with the deck. it took some more time to find parts, but i was trying to nickle and dime it.
yes there are dash kits... and it isnt that bad.
www.crutchfield.com is very helpful.