If you were planning on pulling the lower intake, you might as well just unconnect the fuel lines like you said and pull the lower w/ the injectors still in it. If you wish to pull the injectors out then, it's a lot easier than them being on the car (i'd assume, I did mine on the car and it was a b*tch). To get the fuel rails off of the injectors, you kinda just gotta pull one side a little and then the other and you may have to wiggle it around a bit and you do have to pull REALLY hard. At first, I was trying to be gentle too and then I got mad and just started tugging and it came off.
As for disconnecting the fuel lines, yeah you need that tool and I think you've already been introduced to how hard this procedure is. Sometimes it works, sometimes not. I think you put the tool on there, push the line in, and then pull the line out - I think - it's been a while.
Good Luck