Took me a long time to get the garage that way. The mk1 use to be in the middle for about 8 years more or less surrounded by stuff. I then decided enough was enough and spent months going to the local tip every weekend. Its amazing how much you keep you don't need or have used in years.
I also cheat as I have a 20ft container with all the garden tools, bikes etc in, but thats tidy and organised now too..
The garage still has a not so small to do list. The floor tiled, roof painting, The units hung on the wall, A kitchen top work surface fitted on top of the floor units, Radiator fitted, hot water and mixer tap plumbed in.