Labyrinth/maze

I want it to be solveable and not to messy. Its hard to plan the whole maze up in your head when youre starting in one of the corners. Perhaps I should pick up a scetch-book and a pen to get it right from the beginning?

Or should I start off by putting something in between as a blocker, so I keep my solution-way free as I build and then remove the blockers when Im done? In my experience its hard to get the right pieces out later on if they are put close together.