before I scan the chat log does anyone have a quickstart for using xschem with the analog primitives? I'm trying to switch over and I'm a newbie for xschem so I'm not sure if I need to do something special to connect the spice models to a schematic or if I have to manually do that after I create a netlist? Does the in-app simulation work with ngspice or will I need to do that manually? Is there a easy workflow for determining the sizing or do I need to look at the sim results in the cells directories to pick a likely size candidate then just iterate?

This is what I used to get started. https://github.com/bluecmd/learn-sky130/blob/main/schematic/xschem/getting-started.md

great, thanks!