My walls look like this: I want them to look more like this except w/ a bit of a glaze: I was thinking about taking on the task myself but I learned this morning it is highly advised to remove the existing texture first. I think that pushes it into the "more messy than I want to deal with" category. Anyone ever done this or had this done? Is it too big a pain in the ass to take one oneself? Is it expensive to have done?