Max,
I did mine in February of this year. The front ones are easy to do, you already know that.
I did the back ones without taking the intake off. I used some extensions and universals. It was a bitch, took me 1 1/2 hours, but I just didn't want to take that intake off. The sight of all those hoses and stuff scared me into thinking I may miss something when I put it back together.
It's doable without taking the intake off but it is a bitch! With some patience and a lot of cursing, you can do it too.