yea it will make it easier, because if you are having pain then that means you are doing them wrong and you are straining/putting a lot of pressure on your lower back. ab lounder will help that
a way to fix your problem on the floor if you wanna give it a try is to be in a hollow position when you do it. that means that you have to lay down on the floor, and you know how when you do that your back arches and there is a space between your back and the floor?? well to correct that, you have to curve your spine toward the floor so that there is no space. a way to test if you have achieved that is if you can fit your hand under your back, then you're doing it wrong. from there dont let your back arch again and continue doing the regular crunches /situps