It's not hard & yet no one does it.
They LARP harder & dance around it.
The faraday bag is important, I wouldn't make it yourself unless you're sure it works well.
You probably need two anyways, so you don't need to leave your phone at home.
Discussion
Also,
Make sure to put your phone in the faraday bag wayyyy before you get to your destination...
Plan the trip out of your way in a none traceable way, change of clothes in you backpack with an extra backpack, change in a busy areas bathroom,…
I agree with having multiple faraday pouches/bags/backpacks.
Yes you should probably buy em, but they can be made.
And yes most people have no idea about real opsec