MoViNg?!?!?

(Day 1)
We are moving.. Or did move.. Or something in between the two...
For those of you who don't know - After Eric and I got married we moved into a cozy, small two bedroom home right next door to my in-laws and work.  Was just the perfect way for us to start out - easy to clean, perfect for Connor to grow up and super convenient for all of us!  After a few years Zennon comes along and makes it just feel just that much more crowded.  Bringing baby things back into the house along with all of Connor's toys we found ourselves very overwhelmed.  Papa & Grandma - being the wonderful people they are - decided they were ready to downsize on their home here  since they will be spending lots of time at their home away from home - So, the two of them moved into our home and the 4 of us are spending our first night as Connor would say "in our new home".
I feel alot of different things as I sit here - before I head to bed im nervous, im scared, im anxious, im excited, i am totally overwhelmed by thinking about everything that still needs to be done.  I don't know where I want to put things or even where to begin - There is just so much space, its nuts.
As a kid, I lived in the same house almost my entire life - only moving into my grandma's house (while ours was being built) then moving into our new home when I was in the 5th grade. 
With that said I don't exactly understand what can possibly being going through my 3 year olds head.  One minute he wants his room downstirs, the next he wants his room upstairs, the next he wants baby brother to share with them, the next he doesn't.  He tells me he likes his new room then a few minutes later he wants to go back to his old home.  He tells me he hears noises (just the cars outside) he was spoiled before since his room was in the perfect part of our home.  As I write this they are both sleeping so, we will see how tonight goes.