Thoroughly play-test your map. As you do, make some notes about things you encountered that didn't work as you'd expected. Briefly share these challenges in this forum. Include any suggestions you have from the experience for other designers going through the same process.
When I play-tested the adventure map, I found a few things that needed correcting. Several times, I ended up cutting off redstone circuits that did important functions, like open a door, while constructing other rooms. I had to go rewire the circuits or destroy blocks to make them work again. When I played through City of Testifica 2, I ignored the rules after playing a while so that I could see how the map was constructed. I noticed that the creator of the map had a large circuit area underneath the playable area that connected all circuits in one place with spiraling stairs leading up to the individual targets for redstone power. I also noticed that a minecart system enabled transportation between these (I think. They were broken when I saw them.).
Also, I found that monsters were spawning in rooms that I hoped they were not. I ended up building half blocks along the floor and added more light so they would not spawn in those rooms.
I'm not terribly pleased with the map having played through it. I think part of the reason is because I did not really understand how Minecraft worked when I designed the map. As I built the map, I learned a lot about potential things to do and build in the system, so I came up with better rooms and altered my design several times in response. The rooms I designed later seemed better than the earlier ones. I would also like to situate these "Trials" inside of a greater narrative to tell the story more fully.
One thing I am still confused about is that my map is set to creative mode. Originally, it was survival and then I changed it. Now it won't change back. Is there any way to solve this? I've tried opening the game in LAN and resaving it with different settings in MCedit.