I just landed in terminal two and walked to terminal one. There were no issues, no cracked sidewalks no one (but taxis) giving me a second glance. I'll put up a link to a guide in pictures soon. Walked at 6:30 local time minimal traffic on xmas day.
From terminal two departures level you can see terminal one the bright building to the left. Walk on the left side of the road to the end. They let me in terminal 1'at 7pm despite my flight not leaving until 5:10 am the following morning.