as long as you're putting another stocker in it's actually pretty easy....i switched mine out for a new one in less than an about an hour when the old one sprung a leak. This is one of the times you'll be thankful for having a tiny little 4 cylinder because it leaves plenty of space to get to the rad, drain it, remove the hoses, and remove it. It's all pretty straight-forward without any hidden tricks or special tools.
it's been awhile since I did mine but I'm pretty sure that the bottom just slides into some brackets and there are just a few bolts at the top plus the hoses holding it in place, but don't hold me to that.