Lisa, I have the same problem (no scrap space). I took a stack of 12 x 12 pieces of cardboard ( I saved the ones from CM pkgs of page protectors, etc) and got a cardboard box they would fit in. Now I plan my pages in advance. I gather photos, papers, ideas, die cuts, stickers, etc for a layout and layer them on a sheet of cardboard. Then, I put another cardboard on top and repeat the process. When I have done a small stack, I reverse the order by placing the top one in the box first.
When I am ready to scrap, I don't need to make nearly as big a mess. That makes it easier to talk myself into doing just one page. Most of the supplies I need to make a page are gathered together. I just take the top set out of the box and put it together. At the end of the stack, I always put away the leftovers before I plan my next box of "pages".
Now, having said that, it's time for me to put together another stack and I've been putting it off for days. That is the part that is time consuming, but it is worth it if you don't have space. By the way, this works great for me when it comes to crops as well. I find if I have in mind what I am going to do and have the supplies ready, I can move mountains!