Re: who has a tattoo on there lower back?
It seems everybody is different as far as pain goes with tattoo locations. I have two full sleeves, a large chest piece, the back of my neck, and a large piece on my lower back. For me, my lower back was much more painful than anything else...even my elbows, but it varies from person to person. You might be tempted to take some asprin or drink a bit before you go, but don't, as asprin and alcohol thins your blood and will make you bleed more.
Make sure you go to a reputable shop, there are a LOT of tattoo artists out there who, in blatant terms, suck. Make sure you check out the artists portfolio, to make sure you like their style of work, and that it is quality work. Where do you live? I may be able to recommend a shop to you...